Reloading Podcast 293 - Shotshell basics

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is talking shotshell reloading.  

  1. MEC 600jr

  2. Hornady 366

  3. MEC 9000

  4. Dillon SL 900

  5. Ponsness Warren L/S 1000 




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  1. MEC 600jr

  2. Hornady 366

  3. MEC 9000

  4. Dillon SL 900

  5. Ponsness Warren L/S 1000 




Cartridge corner: 

Reviews:


Please remember to use the affiliate links for Amazon and Brownells from the Webpage  it really does help the show and the network.

Patreons 

  • New Patreons: David D.

  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Mr. Anonymoose, bt213456, Carl K, KC3FHH, Ryan J D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K,Vic T., Bill N, Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 292 - lead hardness and other things

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is answering live chat questions.

  1. https://ballistictools.com/store/reloading-products/three-gage-pack

  2. http://cowboybullets.com/Lead-Tester_p_57.html Cabine Tree tester

  3. NYC reloaders video on pencil tester

  4. http://lbtmolds.com/Products/tabid/5806/Default.aspx LBT hardness tester




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  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Mr. Anonymoose, bt213456, Carl K, KC3FHH, Ryan J D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K,Vic T., Bill N, Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 291 - load development conversation

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is talking about how they do load development.

  1. How about each host speaking to a successful load development story for a favorite rifle (or pistol). For example, give a few minutes to why the specific gun is special and then go into their thought process on selecting which powders, primers, bullets, and their path to that perfect (or best possible) load. Jeffrey




Cartridge corner:The 7mm Mashburn Super Magnum is based on a shortened/necked-down/blownout .300 H&H case, with the case length being 2.630", according to P.O. Ackley Handbook #1. Velocity for a 160 gr bullet was around 3200FPS. There were several other calibers based upon this length.

The .300 Win. Mag. case comes-in at 2.620". There isn’t much difference between the 2 cases in length.

Top loads in a 7MM Weatherby w/160 grainer is approaching 3200FPS.

Top loads in a 7STW approach 3200FPS w/160 gr.

The not-so-popular "7MM Mashburn Magnum Long", different from any of the other 7s, used the .300 H&H case full-length, 2.850". Loads with a 160 gr. bullet duplicate the 7MM Weatherby Magnum velocities. Of course, powder selection back in those days was not as it is these days, so different velocities may be attained when using more modern powders. 

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Reloading Podcast 290 - Wayne from Mighty Armory

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang are talking with Wayne from Mighty Armory

  1. Mighty Armory  Type RELOADING in the discount code box.




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  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 289 - Paul Nelson part 2

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is talking with Paul N again.

  1. https://www.amazon.com/FX-120i-Precision-Balance-Compact-warranty/dp/B00HIU8LJC

  2. https://www.amazon.com/RCBS-Ultrasonic-Cleaning-Solution-Concentrate/dp/B01IC3OHOQ

  3. https://www.sinclairintl.com/reloading-equipment/measuring-tools/case-gauges-headspace-tools/sinclair-bump-gage-insert-prod35265.aspx

  4. https://www.redding-reloading.com/online-catalog/37-instant-indicator-headspace-and-bullet-comparator




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  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 288 - How do you measure what?

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang are answering questions from the live chat


Cartridge corner: under construction

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Patreons 

  • New Patreons: Larry C., Jeff T., Brian M.

  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 287 - spawl fires

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is talking coating and shooting metal targets.

  1. shooting Metal target  Hi guys I enjoy the podcast has helped me out I’m new to reloading I have a question about shooting metal targets do they spark when you hit them I live in Utah so I have to keep in mind that it can be easy to ignite the whole state if you guys could answer this that would be great I have never shot metal targets Herold




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  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 286 - Travis spending more of your money for you

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang are covering more questions.

  1. First off, great show you guys keep it simple and fun, keep doing what you are doing.  After watching the case trim show and wanting to begin loading .223, I am starting to look at case prep tools. As of right now I only load 9mm, so have not worried too much about trimming and such. Therefore, after looking at all the options for cutting, then you still need the debur, chamfer tools and swages. Would like to start off with an automated trimmer not hand turned.  Wouldn't it be best to just buy the Frankford Arsenal trim and prep center in lieu of purchasing everything separately? As JIm would say," Buy once cry once", any opinions on that set up from the group? Thanks. Bill H.

    1. Trim It II

  2. Travis, first off, thanks for helping me spend more money. After you praised Ballistic Tools, I HAD TO go to their web site and what do you know, I had to order!  My question is how do you inspect your 223/556 brass? When you are running a bucket of brass on your 1050, which you don’t know the history of (I think I have heard you say you use range and ’donated’ brass) how do you inspect? Do you simply spot check and if you do, what do you check.  I have become much more vigilant after a case head separation on a piece of LC in my 300 blackout. I was firing it for the second time, so it failed on its 3rd firing when it failed. Thanks guys and keep it up. I travel for work and always look forward to your podcast when I get in the car on Monday morning.

  3. Your podcasts are always entertaining and informative.  I've been wanting to write you guys for a while now but hadn't had the chance.  Keep doing what you're doing and have fun doing it. I listen on my way to work and while at my humble reloading bench and will continue to do so. Thanks!  Matt H.

  4. When you guys were talking about the difference between the loading of a semi auto and the functioning of a puller you missed one of the most important parts of a puller. It is not so much the inertia applied when the puller stops that pops the bullet out, but the bounce back up off of what you hit, that’s why almost all of them are plastic. When it hits and bounces you don’t just have the inertia of the bullet moving and the case stopping you, have almost as much force going back in the opposite direction pulling the case away from the bullet, so there is added force to separate the two.  In a semi auto firearm you don’t have the bounce back, and the bolt travel is losing some inertia from the time it touches the back of cartridge until it closes. As the cartridge leaves the mag there is friction between it and the next round being squished against it by the mag spring, then pushing up the feed ramp, then sliding down the wall of the chamber, all of those slow it down and help prevent bullet from sliding forward when it stops. Of course like you guys pointed out all of this only applies with correct neck tension, if it is too loose you could get the bullet pushing in to the case the whole way forward, then sliding back out when it stops.  Thanks for what you guys do, even after loading and listening for 3 years I still pick up something new almost every episode. And tell Travis to stop being so rich and buying all the cool gadgets that I keep deciding I “need” and can’t afford yet. Mark




Cartridge corner: under construction

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  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 285 -SHOT 2020 Recap

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is recapping SHOT show 2020.




Cartridge corner: 

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  • New Patreons: Larry C., Jeff T., Brian M.

  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 283 - Paul Nelson pt I

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is talking with Paul Nelson about his approach to handloading vs reloading.

  1. handloaders APPROACH TO A NEW RIFLE CUSTOM BARREL As a handloader, I approach a new custom-built rifle as described below. The rifle is based on a Nucleus Action by American Rifle Company, and the barrels are Bartlein Barrels 6 millimeter left hand gain twist. One barrel is a 1 in 14 to 1 in 10 gain twist for lighter bullets and the other is a 1 in 12 to 1 in 8 gain twist for heavy bullets. The rifle is a switch barrel rifle which allows me to adjust this prairie dog hunting rig to conditions. My tool list is a pretty long one but as I have been handloading for over 40 years I have built up a considerable collection.   My first step is to consider cartridge that I need or want, as smaller capacity but high velocity was needed. Selection range was 6mm bench rest, 6 mm PPC USA, 6 x 47 Lapua and the 6XC. For this my choice was the 6XC. Good brass is available from more than one supplier, shoulder angle is steeper and neck is longer allowing shorter bullets to still have good neck tension and bullet holding ability if handled roughly. Next bullet selection, I selected Sierra GameKing 6 mm HPBT #1530 as my standard light weight bullet. It allows me to get to 3200 fps and high enough B.C. to be effective past 600 yards in winds up to 20 miles per hour.  I ordered 1000 Norma 6XC Cases and 500 bullets. I also ordered reloading dies, a full length sizing die was ordered along with a Micrometer seating die. One more step was to size, 5 cases and check neck thickness quickly and seat bullets so no more than 1/3 of the driving band was in the case. All measurements where recorded and the action, barrels and cases where shipped to the gunsmith for chambering and fitting. Case prep: All cases are sized in a full length sizing die without setting the shoulder back. Cases are then checked for neck thickness with a Sinclair case neck sorting tool. This allows me to sort thru cases quickly, finding any that have a lump or are out of round due to neck thickness variations.  Cases that are out of specifications get neck turned with a Sinclair neck turning tool. I am not looking at turning all cases but just taking out the high spots. Primer pockets are next, they get run thru a R. W. Hart primer pocket cutter that has been set to the primer brand that I have selected for that cartridge based on powder type, primer size and case capacity. A Sinclair flash hole deburring tool is lightly touched to the flash hole just enough to remove any burs. This tool is preferred as it has a flat cutting edge as not to form a V shaped flash hole. All cases are then checked for length and trimmed so all are even in size. A Wilson or Forester trimmer is used for the as they are finely adjustable. Next is case capacity, it is checked by weight as filled with water. Water volume is charted and out of average cases get put a side for sighting shots and copper fouling shots. I have run into situations where cases were just to out of spec and have rejected whole factory lots of brass.  All capacity is checked with an A&D EJ‐123 scale that measures to .02 of a grain. Priming: Primers are selected by application as certain primers I trust work better with certain case capacities, or powders (Stick or Ball) and bullet weight. I will leave that out as not to upset or show favoritism to one brand or the others and some primers I use are no longer imported. Priming is done with a modified RCBS Bench Priming tool (Holland’s Shooters Supply) it’s an adjustable stop that you can adjust to recess the primer, stress the primer so the anvil is set and not break the priming pellet. Other priming tool is the RCBS Hand Primer. Powder Charging: Powder charging is accomplished with 4 tools, I have a Harrell’s Custom Powder Measure, a Lee Powder Measure, and Hornady power trickler along with my A&D scale. In experimenting charges the Lee and Hornady are used. The Lee measure has a polymer cutting edge that does not shear large stick powders. Once I have a powder charge nailed down the Harrell’s Measure is really nice as its micrometer adjustments are repeatable and precise. I do see me moving up to the newer electronic setup that AutoTrickler is coming out with. It will be version V3 and offers lots of neat features.  I measure down to .02 of a grain with my EJ‐123. Load selection: I use a number of manuals to determine the powder used. For small capacity cases I try ball powders first if they can give me the velocity needed. Medium and large cases will almost always get stick powders. I select a velocity needed or wanted and a powder that gives me 90 to 100% case fill. I’ll load two tenths of a grain above max load and load down from there till I am two grains below max load. This will be my starting load. If a factory load is made for the cartridge I will buy a box to get pressure measurements of the head of the case. The case is measured before and after firing with a blade micrometer. As for all my precision tools Mituoyo is the brand that I prefer, for this operation the Mitutoyo 422‐330‐30 which gives me accuracy to .00015”. Ten firings give me the average case head expansion for load development. If no factory load is available I will fire and check expansion of the case head and stop when I get .0001” expansion. Other pressure signs are watched as well, Primer flatting, case markings, ejector spring dimple, brass flow into extractor grove, primer pocket looseness. One thing to stress here is primers do lie as pressure indicators, flash hole sizes and over reaming of flash holes, oversized primer pockets can and do cause false pressure signs.    Bullets and Bullet Seating: Bullets that are not hollow point are sorted by bullet length, bearing surface and weight. Hollow point bullets are meplat trimmed and pointed in a Whidden Bullet pointing die. The Meplat trimmer is a Hoover meplat trimmer. High volume shooting has caused me to start coating bullets with HBN2 or hexagonal boron nitride powder. I feel I am getting more barrel life and less fouling. As HBN is non hydroscopic I don’t worry about rusting under the coating and clean‐up is very easy with little to no copper fouling. The plus side is that I am getting 50 to 100 fps increase in speed. As the chamber was cut to allow 1/3 of the bearing surface inside of the case, I have room to grow and chase the lands as the barrel wears. All bullets are seated with a supported shoulder die with micrometer adjustments. Bullet stems are polished and adjusted to the bullets nose. It is more than likely I will end up with more than one seating die, so to save money Hornady seating dies and their micro seating stem help.  

All links will be listed in part II’s show notes



Cartridge corner: none tonight

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Patreons 

  • New Patreons: Larry C., Jeff T., Brian M.

  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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How to get in contact with us:

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Source: https://firearmsradio.tv/reloading-podcast

Reloading Podcast 282 - goodbye 2019

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is answering email questions.

  1. Vibratory tumbling Is there a limit to the time it can go one? I let my stainless pins go long enough to dull the finish on my 9mm. Thanks, merry Christmas from Canada

  2. I was listening to podcast 274, and the talk was about the 9mm reloading not working on some guns if the C.O.A.L was short and pressure also would spike. I'm reloading some 357 Magnum, 158gr. XTP Hornady and the C.O.A. L is 1.590". I'm loading at 1.585''. My question is what should a person strive for? As close to the max C.O.A.L as possible,? Does this only apply to pistol reloads?  Thanks Rick

  3. Just checking in on you guys....hoping all is well.  Message: I've got a bone to pick with you gentlemen.....ya'll cost me some money. Lots of it.  I was bumping along and perfectly okay until I started listening to your excellent podcast. A few episodes was all it took to get the hook set. I'd sold all my single stage years ago when my hunting tapered off to nothing...surgeries, work schedule and such have keep me out of the woods these past few years.  I still enjoy getting over to the local ranges and shooting pistol, though...mainly 9mm, 45acp & 44mag. Your shows helped tip me over the edge to buy some nice progressives that should take care of my needs for a long time. I'm 51 now....my son is a year away from graduating from college....I'm slowing on down on working overtime and hope to get back into hunting more....as well as perhaps get active in some of the local pistol classes and competitions.  I called the fine folks at Dillon after listening....and then later watching your podcast where Mike set up the 650 XL on his bench to show the steps. I wound up buying a 750 for my pistol + 223/5.56 ammo and then a 550C that I will be loading my rifle ammo on. Bought the case feeder for the 750. Will be weighting rifle charges offline for the 550C, I believe. Using Inline Fabrication Ultramounts for both. Almost have my bench in place so I can set my presses up. Have next weekend dedicated to this.  Long commutes to work find me listening to your podcasts. I really enjoy and appreciate the podcasts and enjoy hearing about what you've done that's shooting/reloading related that week. Travis is a stud with his competition shooting. Always fun hearing about the stuff he's working on. Jobs & family commitments are starting to ease up for me and I'm enjoying to get more active in hunting and shooting sports. Fun times ahead. Looking forward to your December 2019 episodes as well as the 2020 future episodes. Thank you, guys !!!!!  Greg

  4. great podcast you’ve really helped with great advise. just wanted some more advise on load development. like i shoot 3 shot groups and in between say 2 moa and 3 moa is like a half moa group is this my best load or out side of 2 and 3 moa maybe 1.5 moa fer like 4 groups thanks again 284 WIN 





Cartridge corner: 7 MM Practical

By Nathan Foster

History

 

Updated August 2018.

The 7mm Practical is a cartridge of my own design. It was initially developed between the years 2010 and 2011, then underwent further R&D towards optimum throat geometry with batch reamer production beginning in February 2017. More than simply 'magnum power', the 7mm Practical has been engineered to produce a high degree of inherent accuracy, versatility, long term wear and user friendliness. Power, accuracy and usability are its key factors. It is for these reasons that the 7mm Practical cannot simply be compared to the likes of the .28 Nosler. Velocity is only one part of this equation.

Having witnessed very short barrel life with the 7mm RUM, yet also having enjoyed the excellent power levels of the RUM, I set about exploring whether it would be possible to obtain the same or similar velocities from a smaller case capacity. One of the major downsides of the 7mm RUM is that it is very much overbore and requires excessive free bore (bullet jump) to reach full velocities. I had already experimented with a half throated 7mm RUM and found this combination to be potentially dangerous due to pressure spikes with mild loads (powder bridging / detonation). Only so much energy can be squeezed through a 7mm orifice and I determined to work towards developing a maximum power wildcat cartridge design, one that would not suffer diminishing returns or have to utilize excessive free bore. The cartridge had to be a simple design, easy to work with and without requiring an extremely long magazine. It had to be practical.

During this period of research I was already aware of and had tested the 7mm STW, an excellent cartridge which Remington adopted but soon discarded in favor of the 7mm RUM. The STW had only one fault, the need for a longer than factory length magazine box if seating long match style bullets close to the lands. For a time I contemplated the possibility that the STW (8mm Remington Magnum parent case) may well be the limit, but I also suspected that the case might still be a touch overbore. Either way, the issue of magazine length prompted me to look towards a shorter case.

Over the years, several hunters have necked the .300 Winchester Magnum case down to 7mm, I was certainly not the first to do so. Some claim that the 7mm-300 Win Mag is nothing more than the 7mm Mashburn however this is not quite true. The 7mm Mashburn Super Magnum wildcat was based on the .300 H&H case shortened, blown out and necked down - not the .300 Winchester Magnum. The Mashburn was designed by Art Mashburn during the mid to late 1950’s. Warren Page, editor of Field and Stream magazine put the cartridge into the public spotlight when he adopted Mashburn’s chambering and discovered its ability to comfortably launch a 160 grain bullet at 3200fps using the powders of the day. Page very much wanted Remington to adopt the Mashburn but instead Remington opted to standardize Les Bowman’s .338 Win mag necked down to 7mm, the now famous and very useful 7mm Remington Magnum.

Although the Mashburn never met fame the concept stayed alive - but only barely. During the mid 1990’s through to more recently, powder manufacturers have developed ultra-slow burning powders well suited to this case capacity. After studying the case capacity of the Mashburn, its similarities to the .300 Winchester Magnum as a parent case and reported velocities along with the occasional but hard to find anecdotal notes regarding the 7mm-.300 Win Mag, I settled on the .300 Winchester magnum necked down to 7mm as a basis for my wildcat case design.

The design premise for my version of the 7mm-.300 Win Mag was to obtain maximum power from the 7mm bore without excessive wear, suitable for the volume of shooting (practice and hunting) I prefer from a long range rig (approximately 12 shots per week on average). The cartridge was to be used for hunting light to medium weight game from point blank, out to true long range distances. The case capacity has since proven to be optimal for a balance of efficiency versus effective power at extended ranges.

I also took the opportunity to incorporate a long neck into the cartridge design. This was achieved by simply extending the neck area of the chamber forwards and allowing cases to grow rather than continually trimming. The shoulder angle was also changed from 25 to 30 degrees. Had I selected a 40 degree shoulder, I would have arrested case neck growth.

There would be no need for special dies or special operations when reloading for this wildcat. The cartridge was designed to utilize a basic and generic 7mm Magnum neck and seating die, (though custom dies can enhance accuracy further).

The wildcat was also designed in such a way that it would utilize an easily sourced parent case. The belted .300 Win Mag case design is easy for gunsmiths to work with, without need of custom head spacing gauges. The Smith can use standard 7mm Remington Magnum gauges to check fit.

 

Finally, I had to come up with a name for the wildcat. I chose the 7mm Practical based on the premise for the design.

After building the first test rifle, load development soon proved that the 7mm Practical was a potent cartridge, meeting my every expectation. The wildcat did however fall slightly short of the RUM by around 50fps even though we used a 28” barrel. Much of this would be addressed via the Revision B reamer (discussed ahead). Following my initial tests, we commenced building rifles for clients, utilizing the expertise of True-Flite NZ to supply and fit their excellent barrels. All of the rifles produced gave sub .3 MOA accuracy which was outstanding. But as more time went by, the Practical began to show stiff chambering and sticky extraction with continually neck sized cases. I had just worn out a .308 Winchester barrel using 60 Hornady cases, neck sized from start to the end of barrel life and saw no reason why the Practical could not do the same - back to the drawing board.

After exploring where the tight spot in the chamber lay, it was found to be occurring at the case body in the area of the shoulder junction - but not the shoulder itself as this sprang back nicely after each firing. I contacted PTG and we re-designed the Practical body dimensions in the same manner as the .284 Shehane, the slightly wider dimensions allowing more room for both expansion and hopefully - spring back. I was greatly concerned about potential accuracy loss but something had to be done to keep the wildcat a simple proposition for end users.

The first rifles were produced using the revision B reamer in December 2011. This final body design proved to be extremely effective with regards to both accuracy and power, allowing end users to adopt shorter 26” barrels and still remain within 50fps of the RUM. Of greater interest was the accuracy. Time after time, barrel after the barrel, these rifles have proven to be very accurate. Sweets spots are generally easy to find and the Practical has proven immensely effective in extreme range match events.

The third and final phase in development came with the help of David Manson, owner of Manson reamers. Over the course of a few years, we had developed a keen friendship which was initially based on our mutual interest in cartridge development and ballistics. When I first designed this cartridge, I opted for a no-throat reamer that would allow smiths and end users to select a throat length to suit individual rifles. However with the passage of time, I found that many end users were making choices that compromised the practical aspect of this cartridge. The most common mistake was making the throats extremely long to hopefully boost velocities with heavy pills including the 195 grain Berger. The problem with this approach, was that the shooter would be committed to this one bullet. If the rifle did not like this bullet (poor accuracy), the job was a bust. This style of throating also failed to account for throat wear and in many cases, the final COAL was too long to feed through M700 magazines. At the opposite extreme, there were a few cases of rifles that were chambered by gunsmiths who failed to make the second cut, resulting in no throat guns, producing dangerously high pressures. A final problem was the potential for eccentric throating.

Following these mishaps I decided to fix the throat length using a base OAL dimension that had worked well in past rifles. The set OAL achieved a balance of accuracy, velocity and versatility (various bullet weights and designs) without compromise. After a great deal of difficult math, David Manson redesigned both the lead length in relation to the optimum lead angle that was necessary to obtain the desired OAL's while  at the same time easing the projectiles into the bore without excessive stress. David also offered to batch produce these reamers. The advantage of this is that it allows the reamer maker to produce more uniform tolerances from reamer to reamer (CNC rather than grind to order) while lowering the costs for the end user. Production commenced in February 2017 and the rifles built with these reamers have been incredibly accurate.

The 7mm Practical reamer is now finally a stock item available from Manson Reamers.

 

7mm Practical C reamer group

The Manson 7mm Practical reamer  produces outstanding accuracy when combined with a good barrel. This group was shot  during proof testing of a new barrel produced and fitted by Grant Lovelock (True-Flite barrels).  Utilizing a basic load in fire formed cases , the group was shot prior to any actual load development.

The Practical was designed to do what its name suggests, to provide a simple, practical cartridge for precision long range hunting. The Practical also excels at closer ranges with suitably well constructed bullet designs. Since my first online research article charting the development and performance of the 7mm Practical, the cartridge has steadily grown in popularity worldwide.



7mm rem mag and Practical for web-980

7mm Remington Magnum at left, Practical on right.

Performance

Over the years, I have developed some extremely potent loads for this cartridge but for long range precision work, accuracy is the key. A long throated gun can drive a 162 grain bullet at around 3275fps. The same goes for 28-32” barreled guns or suppressed rifles which also boost velocities. But publishing such data has a tendency to create over optimistic expectations with folk chasing velocity over accuracy. Taking into account the many rifles in circulation and from a 26” barrel, extreme accuracy sweet spots for the 7mm Practical and 160-162gr bullets are generally between 3200 and 3225fps. Bullets weighing 175 to 180 grains generally produce sweet spots at around 3000 to 3050fps. The 195 grain Berger can be driven at velocities of 2950fps to 3000fps.

The 7mm Remington Magnum with a 26” barrel (e.g Remington Sendero) tends to produce average high end sweet spots of 3070fps with a 160-162 grain bullet though some rifles boast velocities of 3125fps. Sweet spots for 175-180 grain bullets can be as high as 2925fps however the 180 grain ELD-M tends to work best at around 2860fps in the Remington. The Practical therefore produces velocities which are on average 125 to 150fps faster than the Rem Mag. The 7mm RUM generally produces sweet spots with 160-162 grain bullets at 3275fps. The Practical (without mucking around with long barrels or long throats) is therefore 50-75fps behind the RUM but with much greater barrel life and with much greater (or easier) accuracy. The Practical can last to and beyond 1200 rounds while the 7mm RUM can fall over anywhere between 400 to 600 rounds. A bore scope is all that is needed to provide hard evidence of this. The Practical truly is a common sense limit for the 7mm bore.

The 7mm Practical is best suited to light through to mid weight game species but is also able to tackle larger game species with new select bullets, more so now thanks to new heavy weight bullet designs. The high velocities of the Practical can be used as a means to maximize wound trauma at extended ranges with minimum wind drift. The Practical cannot however fire the very heavy 200-285 grain bullets that prove so effective in the .300 and .338 magnums when used on large heavy bodied game. Elk are the upper limit for the 7mm Practical.

This is a very flat shooting, wind beating cartridge and at times, it feels as though one is almost cheating, such is its good performance. The Practical makes the .338’s seem like old Cadillac’s in comparison. Due to the nature of my work, I spend a great deal of time testing the .338 bores and it is always a relief to go back to the laser like performance of the Practical. At “extended ranges” of 400-600 yards, shots can be taken with a great deal of ease. At 700 to 800 yards, the Practical really begins to come into its own. At truly long ranges, one becomes infinitely grateful for its abilities.

Below is a video study of the 180 grain ELD-M bullet. Please note that this video contains graphic footage with no editing relative to the speed of kills. It is therefore set to 'unlisted view' on youtube to prevent general public access.



Those who wish to lean more about 7mm bullet performance can find this information within the 7mm Remington Magnum , 7mm STW and 7mm RUM texts within this website knowledge base. For more detailed information on long range killing performance, please see my book, the Practical Guide to Long Range Hunting Cartridges. This book covers bullet performance from the ground up in a manner that is not described on this website. My book also uncovers the faults in several bullet designs that can lead to slow killing at long ranges. If a person wants to shoot and kill at long ranges, I believe that they must develop a deeper understanding of the rifle, the cartridge, shooting techniques and hunting strategies. And besides, I have given enough away freely via this website. The book series provides both the new and experienced long range shooter with this deep understanding while helping to fund this free knowledge base that you are currently reading.



vital wounding at 1125 yards WL-210

Liver wounding at 1125 yards (see video at bottom of article).

Happy practical shooter WL-47

A happy Practical owner with a Pitt Island ram

Throat wear for the Practical is approximately .1mm / .004" per 400 rounds with general hunting and light practice- provided the throat is kept polished to close pores within the bore steel. Barrel life is approximately 1200 rounds. Having said this, the most aggressive wear we have seen so far is one rifle which grew .040" at 400 rounds as a result of heavy gong shooting sessions. Another grew .040" at 700 rounds with high round count field shooting and no throat care. In the opposite extreme, a comp rifle finally came in to True-Flite for a new barrel after firing 2000 rounds at which point the owner said that the rifle was still shooting well to 800 meters but no further.

Most shooters tend to think that abrasive polishing will literally wear the bore down but the opposite is true when it comes to throats. It is very important to keep the pores in the steel closed as is the same in other engineering practices such as stainless food grade vessels and stainless marine. Please see my book, the Practical Guide To Bolt action rifle Accurizing and Maintenance for more details on this subject.

 

 

Manson web

 

Gunsmith notes

7mm Practical- Manson reamer. Fixed throat, removable pilot.

When reaming a 7mm Practical chamber, the one piece of advice that you must adhere to for non-finicky performance, is to give the Practical (and other belted magnums) some breathing space. This is important whether the end user intends to use this cartridge for hunting or competition. To be absolutely clear, all True-Flite barreled tack driving Practicals are reamed 6-7 thou forwards.

Note that your go gauge is -5 thou while your no-go guage is +5 thou. Please ream forwards until the bolt is either able to almost close or is able to close on the no-go gauge but with a measure of resistance. This will set the chamber forwards of its mid headspace point. The customer can then fire form and headspace his brass at the shoulder. The shoulder will stretch well before the case head is able to move forwards. This will make reloading easy and saves a great deal of headaches. A common problem for example, is rifles being returned to the smith after the customer has stretched cases during initial case forming operations (such as extruding the case by accident over an expander button). This and other belted case reloading dramas can all be avoided by letting the case breathe. And as suggested, this approach is optimal for belted magnum accuracy.

The optimum twist rate for this cartridge is 1:9. The velocity generated ensures that all bullet weights will be stable. If a 1:8 twist is used, the rifle may prove immensely finicky with 162-180 grain bullets. Groups sizes at 100 yards may be up to or over 4 MOA and projectiles may also tumble mid flight regardless of whether the bore has 3, 4, 5 or 6 grooves. About the only time you may wish to choose a 1:8 twist is if the rifle is to be used for competition only (not hunting) using the 195 grain Berger bullet. But note that this comes with risks. If the rifle does not like this bullet, the barrel may have to be pulled as it is unlikely that the rifle will behave with other bullets. If a client insists on an 8 twist barrel, you must inform the client that should the rifle prove inaccurate, the onus for replacement is on him- not at your cost. The only advantage to using the 8 twist rate with this bullet is for those who wish to shoot through the transonic barrier. Again, this is purely relative to extreme range shooting contests and has nothing to do with hunting. It is unethical to attempt to hunt with this cartridge at these ranges as bullet performance is wanting, regardless of whether the bullet has labeling attached to it such as the words Extreme or Hunter.

As a side note the Remington Sendero 7mm Rem Mag 9.25 twist is generally fine with all bullet weights up to and often above 180 grains. These can therefore be rechambered to 7mm Practical without twist rate concerns.

The Manson reamer will cut the chamber to produce a max COAL of approximately 91mm (3.583) using the 162 grain ELD-M or 92mm (3.622") using the 180 grain ELD-M. This COAL suits a very wide range of bullets without compromising magazine space. Suitable actions include the Win M70, the M700 and its clones. The Howa / Vanguard and traditional Sako (e.g Finnbear) magazine is 91mm or 3.543” in internal length. This is the shortest magazine one can utilize resulting in bullet jumps between .5 and 1.5mm or 20 to 60 thou or longer depending on the bullet used. I would nowadays rather (if push comes to shove) lengthen the Howa magazine than ream short, simply because we are now seeing more and more long bullets (regardless of whether the customer opts for the Practical or parent Win Mag).

 

 

7mm Practical revision D Web



Progression of design:

Revision A (2010): Prototype, NZ only.

Revision B (2011): Enhanced body, no throat,gradually came into circulation in U.S.A, Australia, NZ, New Caledonia.

Revision C (2017): Fixed throat, worldwide use.

Revision D (2018): Subtle change. Due to worldwide popularity and potential reamer wear, additional neck error tolerance now added to CNC programming to ensure safety. This does not directly effect the end user. Tolerance at neck can still be considered tight.

 

Hand loading

Brass for the 7mm Practical can be obtained from readily available .300 Winchester Magnum brass. My favorite brass is Winchester due to its tough nature followed by Hornady. Norma / Nolser brass has unfortunately a tendency to be weak at the case head (primer pockets) and I have also come across batches with thick necks that must be neck turned before they can be put to use in the Practical.

My favorite dies for extreme accuracy are custom Lee die sets, currently stocked (limited supply) both here in NZ (via this website) and in the U.S via Manson Reamers. These die sets consist of full length dies, neck collet dies, seating dies plus a spare undersize mandrel for neck tension / ES experimentation.

Other suitable neck dies include the Redding .300 Win Mag neck bushing die fitted with 7mm neck bushings, Forster 7mm Remington Magnum neck dies and the Hornady 7mm “Magnum” neck die. The Forster die has a 25 degree shoulder angle therefore it cannot fully size the neck shoulder junction of the Practical however the same can be said of Redding which never fully sizes the neck regardless of the case design.

Hand loading practices are straight forwards without any special processes. The .300 Win Mag case is necked down, primed, charged, a 7mm bullet is seated. The first shot forms the case, after which the hand loader simply continues neck sizing. As previously mentioned, the Practical has what we might call inherent accuracy built into its design. Those who focus solely on power comparisons between this and other cartridges will fail to understand this and other factors. The point being; provided the rifle has a good bore, a sound bedding job and is held the way a man should hold a rifle, the hand loader can achieve good results by focusing on basic principles such as determining OAL's, safe incremental load development and concentricity.

True flite banner

Please note that while the case necks are at their shortest prior to growing, it is possible to collect carbon in the neck area of the chamber (more so if using a suppressor). If this carbon builds up, chamber neck dimensions are reduced, lifting pressures and ruining accuracy. It is therefore extremely important to occasionally clean the neck area of the chamber with a bronze brush and solvents (use a spiral cleaning motion, not back and forwards). A simple test is to pass a projectile fired through a fired case neck. If the projectile passes easily into the neck, all is well. If the case pinches the projectile, there is a problem with either carbon build caking or heavy walled brass.

The very best powder for the Practical is H1000 (ADI 2217). Retumbo (ADI 2225) also works extremely well, along with other similar burn rate powders.

Basic case specifications are as follows:

Max case length: 2.657 (67.5mm)

Case trim length: 2.645 (67.2mm)

Neck length for the Practical when trimmed is .289 (7.3mm). Several shots are required before cases will grow to the ideal 2.645 length.

Load data for 26” barrel, Manson reamer. Winchester brass, Federal 210 standard primer, bullet jump .2mm / 10 thou. H1000 (ADI 2217) Retumbo (ADI 2225) Yes- data is for both due to powder behavior in this case.

Approach accurate column loads with extreme caution!!!

 

Bullet weight

Start load

Accurate 

Velocity

Comment

162gr ELD-M

76

78.5

3200-3225

Always reliable.

160gr TMK

162gr ELD-X

73.5

76.5

3200-3225

Caution with TMK as bearing surface raises pressures. Caution with ELD-X and other heavy jacket bullets (pressures).

175 ELD-X

70

73

3050

Caution with this heavy jacket bullet (pressures).

180gr VLD

 

72

75

3050

 

180gr ELD-M 71 74 3000 Extremely accurate. Watch

for pressure spikes, approach 74gr with extreme caution.

195gr Berger EIEIO

70

73.5

2950

 

 

Please use a magnum primer if you intend to shoot in freezing winter conditions. Reduce loads by 1 grain in comparison to above non magnum primer loads.

Please do not try to “guess the COAL” based on the max COAL’s that were quoted in this article. You must have a good understand of reloading practices and how to determine your COAL before beginning to reload for the 7mm Practical. This and other subjects are covered in my book, The Practical Guide To Reloading. Furthermore, do not think that by simply mating a barrel to an action that this will give you 1000 yard reach. Both the rifle and the shooter must be in optimal form. These subjects are again covered in the book series, laid out clearly for all to follow. The 7mm Practical is the tool while the books are the means to understand how to use this tool. There is nothing worse to me than seeing this very straight forwards cartridge ending up as some tactical nightmare with a thousand add ons that spends more time “doing the rounds” at every available chop shop because it just won’t shoot right, costing the shooter many thousands of dollars with the cartridge never living up to its name. So please make sure you do this right, from the ground up. The rifle and the shooter must progress together.

The 7mm Practical can be hand loaded to perform well at both close and exceptionally long ranges. It can also be put to great use with lower BC hunting bullets, enhancing effective ranges in a meaningful manner. As an example, the Practical loaded with either the 160 or 175 grain Nosler Partition bullets, maintains very wide wounding out to ranges of around 550 yards, wounding steadily tapering off thereafter with a maximum effective range of around 850 yards. The Practical has an effective hunting range of over 1400 yards with the ELD-M bullet designs.


My Practical-182

My 7mm Practical. Remington M700 action, True-Flite barrel, HS Precision stock, Warne base, Leupold rings and Sightron SIII 6-24 x 50 Mil Dot scope. So many wonderful adventures.

 

Closing comments

The 7mm Practical is a simple, effective wildcat. The Practical is a joy to work with, a potent wind cheating hard hitting cartridge which delivers on all fronts. I do not believe this is a cartridge for those new to extended or dedicated long range shooting; the 7mm Remington Magnum is more than enough gun for most folk. On the other hand, the inherent accuracy within its geometry can sometimes make it easier to work with than factory chamberings.  In any case, for those who really wish to shoot long, the Practical is an honest cartridge that achieves its goals of reaching maximum velocities from the 7mm bore without need of excessive free bore and without excessive barrel wear.

Although this cartridge has been around for several years, it really is only just coming into its own now thanks to new bullet designs.

Reamers (and dies) can be purchased directly  from Manson Reamers (world wide shipping).

Dies can also be purchased (world wide shipping) from this website (please shopping pages for stock).

New Zealanders can contact True-Flite NZ directly for rebarreling and reaming operations. True-Flite produce an exceptionally accurate 4 groove canted land 9 twist barrel. These are simply wonderful barrels.

 




Link to article:https://www.ballisticstudies.com/Knowledgebase/7mm+Practical.html


Discuss this article or ask a question on the forum here

 

Copyright © 2007-2017 Terminal Ballistics Research, Ballisticstudies.com


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Reloading Podcast 281 - talking a bit about trimming

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang are talking a bit about trimming, and mike lost the show notes… 




Cartridge corner: 

Reviews:


Please remember to use the affiliate links for Amazon and Brownells from the Webpage  it really does help the show and the network.

Patreons 

  • New Patreons: Larry C., Jeff T., Brian M.

  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 280 - FW Arms Live

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang are talking to FW Arms.

F.W. ARMS

Owner:  Will Aerni       

Website: fwarms.com

Products:  auto-case centering decapper/deprimer   $54.99

                 Auto-case centering swage foot                $54.99

                 

Talk about the history of the decapper. How it came about and how working with people in the industry has helped to make it better. What versions of the decapper pin does he offer now and what will be available in the future. What changes has been made to the swage backer unit?  What new products does he have coming out? [Coming out with a case feeder for the annie annealer. Coming out with speciality case feed plates for the dillon 1050] How did he start reloading and what does he currently shoot and reload for now. What is his favorite cartridge to reload for? Is he for traditional lubing of his cast bullets or is he for powder coating? LO




Cartridge corner: 8×50mmR Lebel


The 275 Rigby was requested recently and it’s known in the United Kingdom as 275 Rigby but it’s aka 7X57 Mauser covered in episode 234



The 8×50mmR Lebel (8mm Lebel) (designated as the 8 × 51 R Lebel by the C.I.P.[1]) rifle cartridge was the first smokeless powder cartridge to be made and adopted by any country. It was introduced by France in 1886. Formed by necking down the 11×59mmR Gras black powder cartridge, the smokeless 8mm Lebel cartridge started a revolution in military rifle ammunition. Standard 8mm Lebel military ammunition was also the first rifle ammunition to feature a spitzer boat tail bullet (balle D), which was adopted in 1898.[3] The long-range ballistic performance of the 8mm Lebel bullet itself was exceptional for its time. For use in the magazine tube-fed early Lebel rifle, the 8 mm case was designed to protect against accidental percussion inside the tube magazine by a circular groove around the primer cup which caught the tip of the following pointed bullet. However, the shape of its rimmed bottle-necked case, having been designed for the Lebel rifle's tube magazine, also precluded truly efficient vertical stacking inside a vertical magazine. The bolt thrust of the 8mm Lebel is relatively high compared to many other service rounds used in the early 20th century. Although it was once revolutionary, the 8mm Lebel was declared obsolete after World War I and was soon after replaced with the 7.5×54mm French round.


Contents

1 Note

2 8×50mmR Lebel rifle ammunition

3 Downrange performance comparison

4 Weapons using the 8mm Lebel round

4.1 Rifles

4.2 Machine guns

5 Users

6 See also

7 References

8 Sources

Note

There are two commercially available 8mm Lebel cartridges: one for the Lebel Model 1886 rifle, and one for the Modèle 1892 revolver. They are two entirely different cartridges and are not interchangeable. The term "8mm Lebel" for the French Mle 1892 revolver ammunition, is only applied outside France for commercial reasons. However, the term "8mm Lebel", used to identify a rifle cartridge, is widely recognized to distinguish the French rifle cartridge from other 8 mm rifle cartridges, such as the 8×50mmR Mannlicher cartridge used by Austria-Hungary and its successor states.

8×50mmR Lebel rifle ammunition

It was originally loaded with a 15.0 g (232 grains) cupro-nickel-jacketed, lead-cored, flat-nosed, wadcutter-style bullet (balle M) which had been designed by Lieutenant Colonel Nicolas Lebel. The flat point (flat nose) of the balle M bullet had been designed to be totally safe inside the Lebel's tube magazine. It was propelled by the first practical smokeless, nitrocellulose-based, (''poudre'' B) powder as developed by Paul Vieille in 1884. The ballistic performance and range of balle M eclipsed all the previous military ammunitions in existence at the time (1886).


Technical drawings of the French 1898 pattern balle D bullet

The balle M was replaced in 1898 by a 12.8 g (198 grains) 90/10 bronze mono-metal, pointed (spitzer) boat-tail bullet called "balle D", which provided a flatter trajectory and improved long-range performance. Designed at APX (Atelier de Puteaux) by a Captain Desaleux, balle D was the first spitzer and boat-tail bullet to be placed into service by any army. Later on, in 1912, balle D ammunition was improved into balle D am ("am" stands for "amorcage modifié" or "modified primer") by crimping the primer in to prevent primer expulsions when fired in machine guns. Balle D am ammunition was in near-universal service during World War I (1914–1918) in all Lebel-caliber weapons. Balle D am ammunition was followed in 1932 by balle N ammunition, which featured a lead-cored, cupro-nickel-over-steel-jacketed, spitzer boat-tail bullet weighing 15.0 g (232 grains). It was held into a case which had a slightly larger neck diameter than the older balle D am ammunition. Balle N was heavier than balle D am and had been designed to improve the long-range performance of the Hotchkiss machine gun. Converting most Lebel-caliber rifles and carbines to the "N" ammunition was carried out during the 1930s. Balle T tracer and balle P armor-piercing rounds were also produced, along with blank and reduced charge ammunition.

In order to safely accommodate pointed (spitzer) bullets inside the Lebel's tube magazine, a circular groove was machined around each primer cup on both balle D am and balle N ammunitions. The role of that circular groove is to receive the tip of the pointed bullet that follows when loaded inside the Lebel's tube magazine. Furthermore, all Balle M and Balle D French military ammunitions feature convex primer covers which are crimped in over the primer itself. Those small convex primer covers are not noticeable, but do provide a second effective protection against accidental primer percussion inside the Lebel's tube magazine. Wartime experiences (1914–1918) involving hundreds of millions of Lebel rounds fired in combat have entirely confirmed the effectiveness of these protections.

While revolutionary for its time in terms of ballistic performance, the 8×50mmR Lebel cartridge had its drawbacks. Formed by necking down the 11mm Gras rifle cartridge case, it was an odd design, with a thick rim and a rapid double taper. This made it more difficult to feed from standard magazine firearms such as the Berthier and the Chauchat, and is the reason for the distinct curvature in the magazines of those firearms. The Lebel rifle from which it was fired was also nearly obsolete by the time balle D, let alone the balle N, came along.

Balle N ammo can only be fired from any Lebel or Berthier rifle if the chamber has been reamed to accept the larger neck of the N cartridge. Such weapons are stamped N on top of the barrel, just in front of the receiver and behind the rear sight. Balle N ammo is identifiable by the fact that the bullet, while pointed like the solid-brass balle D, is lead-cored and jacketed with soft steel.


8mm Lebel dimensions

While newly manufactured 8×50mmR Lebel ammunition has recently become available in the U.S., reloadable cartridge cases can also be produced by reforming .348 Winchester brass. Newly manufactured Prvi Partizan 8mm Lebel ammunition is of excellent quality and replicates the performance of the original 8mm Lebel round. However, its older brass cases lack the circular groove around the primer cup, so reloaders use only round-nosed or flat-nosed bullets when producing handloads for the tube-magazine Lebel rifles with the older Privi Partizan cases. Recently manufactured Privi Partizan 8mm Lebel ammunition with spitzer bullets incorporate the circular groove in the head and are safe when stacked in the box-magazine of the Berthier rifle and the Mle 1886 tubular magazine rifle. Older Privi Partizan cases loaded with spire point bullets are fired single shot. Newer Privi Partizan cases with the circular groove follow the balle D specifications and may use the magazine for loading.

In 1929, the 7.5×54mm MAS mod. 1929 (7.5 French) cartridge was introduced. This made the 8×50mmR Lebel cartridge obsolete overnight, but due to post-World War I financial constraints and political neglect, it was not introduced as a rifle cartridge until the adoption, just before World War II, of the MAS-36 rifle.

Downrange performance comparison

1886 pattern 8×51mmR Lebel balle M load

Distance (m) 0 200 400 600 800 1,000 1,500 2,000

Trajectory (m) 0 0.14 0.81 2.39 5.27 9.83 31.71 75.61

Velocity (m/s) 628 488 397 335 290 255 197 160

1898 pattern 8×51mmR Lebel balle D load

Distance (m) 0 200 400 600 800 1,000 1,500 2,000

Trajectory (m) 0 0.12 0.54 1.43 3.01 5.60 18.30 44.0

Velocity (m/s) 700 607 521 448 388 342 278 240

Weapons using the 8mm Lebel round

Rifles

Lebel Model 1886 rifle

Berthier rifles and carbines

Model 1917 semi-automatic rifle

Fusil Gras mle 1874

Remington Rolling Block rifle - a limited production for France before or during WWI

Machine guns

Hotchkiss M1909 Benét–Mercié machine gun

Hotchkiss M1914 machine gun

Chauchat light machine gun

Madsen machine gun

Chauchat-Ribeyrolles 1918 submachine gun

St. Étienne Mle 1907

Vickers machine gun

Info source was Wikipedia 

Reviews:


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Patreons 

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  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K, Vic T., Nick M Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 279 - You did what to that primer pocket

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang are talking about primer pockets.

  1. Primer Pocket treatment

    1. RW Hart primer pocket uniformer

    2. Competition Primer Seater







Cartridge corner: 7mm Remington Ultra Magnum  


History  



Inspired by the Lazzeroni proprietary cartridges, Remington introduced the 7mm Remington Ultra Magnum in 2000. The 7mm RUM is based on the .300 Remington Ultra Magnum (1999) which is in turn based on a grossly modified version of the unbelted 404 Jeffery’s case. The RUM was designed to produce ultra high velocities to meet the growing demand for long range hunting rifles and cartridges.



Since its introduction, the 7mm RUM has achieved a mild following among long range hunting enthusiasts. That said, it is a chambering which hunters generally eventually move away from due to short barrel life.

 

Performance



From a 26” barrel, the 7mm RUM typically achieves 3450fps with 140 grain bullets, 3275fps with 160-162 grain bullets and 3175fps with 175-180 grain bullets. Velocities ‘should’ in theory be higher than the 7mmSTW which has the same case length but a much narrower body resulting in less case capacity. Nevertheless, the law of diminishing returns relative to overbore capacity dictates that the RUM only achieves around 30fps higher velocity than the STW when both are hand loaded to optimum potential.

 

Ultimately, only so much energy can be pushed through a 7mm orifice. A car engine is no different, a small 4 cylinder engine can only produce x amount of energy based on its cylinder bore capacity. Regardless of advanced methods of forced carburation, beyond a certain point, the engine suffers excessive wear, the valves burn out, bearings cannot take stress loads and so forth. The 7mm RUM is identical to a high performance race engine in every sense.

 

To optimize performance of the 7mm RUM, Remington engineers produced a chamber design utilizing .400” (10mm) free bore. This free bore acts as a gas expansion chamber, maximizing velocity due to a longer pressure curve. The case itself is designed for a working pressure of 65,000psi however, brass is brass and case life is not that high.

 

Due to the long free bore, bullets featuring short bearing surfaces must go through a phase during firing where the bullet is neither engaged in the case neck, nor guided by the rifling, literally free of control. Often, projectiles engage the rifling slightly off center resulting in poor accuracy. Some rifles appear to be forgiving of bullet design, producing acceptable accuracy with 162-168 grain bullets while others are only capable of producing optimum accuracy with either the 175 grain SMK or 180 grain VLD, neither of which are available as factory loads.

 

Custom, short throated 7mm RUM’s can and do produce extremely dangerous pressures with mild loads (89 grains powder). Such configurations generally have to be loaded to exactly 65,000psi pressures tend to be in the region of 70- 80,000psi when the cartridge is loaded both below and above optimum pressure having a window of only one or two grains powder leeway. To this end, it is most in-advisable to adopt a short (.200”) free bore configuration.

 

Barrel life of the 7mm RUM is extremely short due to hot gas erosion which occurs at the start of the rifling, the carefully cut leade which guides the projectile into full engagement of the bore. Used in the same manner as a standard hunting or target cartridge, barrel life is generally approximately 600 rounds. Barrel life can be extended up to and beyond 1000 rounds by allowing the RUM to cool to ambient temperatures between shots and cleaning (powder residues only) between 3 shot strings, however in the field this is often impractical. A few die hard fans of overbore cartridges insist on minimal practice and minimal field usage as the key to long barrel life in the Ultra Magnums however, any placed competitive shooter would suggest, that the key to successful shooting at long range is practice and not with a different rifle/cartridge.

 

The Remington factory rifle barrel contours and lengths are also detrimental to the performance of the 7mm RUM. The M700 SPS has a light contour barrel which overheats quickly and is too short at 26” for optimum performance. The 7mm RUM is better served with a heavy contour barrel of a minimum 28”, driving 180 grain bullets at 3200-3250fps. Remington do produce one heavy barreled rifle, the Sendero, but with a 26” barrel. These factors are unfortunately market driven.

 

Difficulties aside and where accuracy allows, the 7mm RUM is an outstanding performer on medium game, producing absolutely emphatic kills out to 800 yards and clean kills out to and beyond 1000 yards at which range speed of killing is dependent on target resistance to aid bullet expansion. The one limiting factor, is that at point blank ranges, the 7mm RUM often fails to generate hydrostatic shock, resulting in dead running game. This type of performance can be a major frustration to mountain hunters, losing dead run game to ravines.



 Factory Ammunition



Remington factory loads include the 140 grain Core-Lokt Ultra at 3425fps, the 150 grain Swift Scirocco at 3325fps and the 175 grain A-Frame at a mild 3025fps. Unfortunately, Remington do not produce a load capable of producing fast, clean killing at long ranges.

 

The 140 grain Core-Lokt Ultra has replaced Remington’s initial load for the RUM featuring the 140 grain traditional Core-Lokt which surprisingly, managed to hold together at RUM velocities and produce excellent performance on lighter medium game. The new core bonded bullet is better suited to a wider range of body weights and to some extent, less prone to producing excessive meat damage. BC of the Ultra is .409 which is of curse counterproductive to the design premise of the RUM however; this bullet produces fast killing out to 350 yards.

 

Remington’s 150 grain Scirocco load is a spectacular performer on medium game, producing best results inside 400 yards (2600fps) and clean but slightly delayed killing as velocities approach and fall below 2400fps, having the same limitations as all core bonded bullet designs. The 150 grain Scirocco is adequate for use on deer weighing up to 150kg (330lb) but can tackle heavier animals, especially as velocity approaches 2600fps and below. The 175 grain A-Frame is an excellent bullet for tough, heavy bodied game. Again, as has been re-iterated throughout the 7mm texts, regardless of muzzle velocities, the 7mm bore produces limited wounding on large heavy animals. The A-frame produces cross body penetration on large, heavy bodied game but hunters should always be mindful of the  limitations of the caliber.

 

Hand Loading

 

Brass for the 7mm RUM is available from both Remington and Nosler. Suitable powders include H1000, Retumbo, H50BMG while US 869 is perhaps the optimum powder for this cartridge. Bulk density is a concern when hand loading the RUM and both H1000 and Retumbo can sometimes pose problems due to under filling, causing high shot to shot velocity deviations which greatly reduce accuracy beyond 600 yards. These powders must be loaded to full pressures to produce optimum results. At the other extreme, H50BMG is extremely course, much the same as short grain rice and full velocities are only achieved with compressed or near compressed loads. Due to its course nature, H50BMG has the potential to cause significant abrasion within the throat area of the bore. U.S 869 suffers none of the above problems.

 

From a 26” barrel, the 7mm RUM produces 3450 with 140 grain bullets, 3350fps with 150 grain bullets, 3300fps with 154 grain bullets, 3275fps with 160-162 grain bullets, 3220fps with 168 grain bullets and 3150 to 3175fps with 175-180 grain bullets. 



Although the 7mm RUM can achieve sizzling velocities of 3450 to 3500fps with 140 grain bullets, most produce fairly slow killing at close ranges. On impact, the hide of thin skinned game becomes as hard as bone. Entry wounding is violent however, having lost much energy against the hide, eliminating any potential shock transfer, the animal remains conscious throughout this trauma. The animal may run anywhere from 25 to 100 yards before succumbing to blood loss.



In the 7mm RUM, the only truly reliable 140 grain bullets are the Partition and core bonded designs which include the 140 grain Accubond and 139 grain InterBond. Even the well constructed 139 grain SST fails to produce emphatic killing when used on light bodied game inside 100 yards. At longer ranges, conventional 140 grain bullets produce more uniform performance however the throat erosion caused by high powder charges and excessive heat outweighs all benefits. Bullet jump and loss of concentricity is yet another problem.



150 grain conventional bullets produce much the same results as the lighter 140 grain bullets in the 7mm RUM. Again, bullet to bore concentricity is often lost during ignition while performance on game is less than spectacular at close ranges. Of the conventional bullet designs the 154 grain SST will sometimes produce acceptable long range accuracy and fast killing. This bullet works well alongside the 154 grain InterBond as a dual loading, the SST for long range work, the IB for close range hunting.



The 160-162 grain bullet weight is realistically the lightest bullet weight suitable for the RUM regarding both accuracy and killing. Two very forgiving bullet designs are the 160 grain Speer Hotcor and Speer BTSP.  These bullets tend to produce excellent accuracy in the 7mm RUM and can be adapted to hunting light to medium weight game, the Hotcor for close range work, the BTSP for longer range work. The BTSP has a BC of .519 which is not exceptionally high but from a muzzle velocity of 3275fps, produces clean killing out to 740 yards.



Hornady produce three very good projectiles, the 162 grain BTSP, the 162 grain SST and the 162 grain A-Max. The 162 grain BTSP Interlock is a basic bullet suitable for hunters on a limited budget. This bullet is extremely effective and spectacular on lighter medium game, producing faster kills at close ranges than other conventional bullet designs driven at velocities above 3200fps. BC is .514 and the Interlock tends to produce best performance at impact velocities above 2200fps (600 yards) but is adequate out at 720 yards as velocity approaches 2000fps.



The 162 grain SST is one of the best bullets available for use in the RUM. Its only limitation is at point blank ranges where it occasionally fails to impart hydrostatic shock due to the increased target resistance associated with ultra high velocity, though wounding is thorough and killing usually only slightly delayed. At 3100fps (90 yards), the SST comes into its own, rendering wide wounds and exit wounds of up to 3” in diameter on medium sized game. The 162 grain SST is not well suited to heavy bodied game at close ranges but at long ranges, beyond 600 yards, this bullet is perhaps the optimum choice for large bodied game. BC of the SST is .550 and although this is lower than the likes of the A-Max, this bullet should not be over looked as it offers performance which other bullet designs cannot duplicate. Maximum effective range for the SST is up to and beyond 1000 yards depending on target resistance.



The 162 grain A-Max is an excellent hunting bullet. As has been reiterated throughout the 7mm magnum texts, its one limitation is that if used at close range on large bodied medium game, wounding can be shallow with shoulder shots. As an all-round load, the A-Max must be used with care. With time and experience, the A-Max can be used to great effect not only for dedicated long range hunting, but as a general purpose medium game load. As a long range hunting bullet, the A-Max has no peer, no other bullet is able to produce the same level of consistently wide wounding at velocities as low as 1400fps, equating to a whopping 1450 yards in the 7mm RUM.



Nosler’s 160 grain Partition and 160 grain Accubond are both good performers in the RUM. The RUM chamber design seems to work very well with the Partition and in some instances, the Partition can produce greater accuracy than 160-162 grain boat tail bullet designs. Although the Accubond has a high BC of .533, the Partition is the more violent of the two at all ranges. Both are good projectiles for use on larger bodied medium game however for both light and heavy bodied medium game, the Partition is a much more spectacular killer. That said, the Accubond produces much less meat damage. The Accubond tends to produce fast killing inside 360 yards with a reduction in speed of killing as it falls below 2600fps. The Partition continues to produce wide wounding out to ranges of around 675 yards (2000fps), producing emphatically fast kills at intermediate ranges.



Berger’s 180 grain VLD is extremely well suited to the long bullet jump of the 7mm RUM, producing optimum accuracy. Performance on game at both close and long ranges out to 1000 yards is outstanding and the 180 grain VLD can tackle a wide range of game weights. 



Note: Update 1 Jan 2011. Berger have recently thickened the Jackets on the VLD line of projectiles due to concerns from hunters that the VLD was suffering mid air bullet blow up (perhaps due to aggressive twist rates in custom rifles?). The new 180 grain VLD is very stout and can produce pin hole wounds on light bodied game at all ranges, regardless of ultra magnum velocities. This problem can be minimized by annealing the ogive. Place the VLD projectile in a pan of water with only the ogive exposed and heat the ogive with a blow torch duplicating the traditional method for annealing brass. The annealing should be aggressive, as to cause a permanent color change. Accuracy is unaffected providing care is taken. When used un-annealed, the new style 180 grain VLD is more suited to heavy bodied medium game at extended ranges, filling its own niche.

 

Closing Comments



The high cost of ammunition coupled with excessive throat erosion/ limited barrel life has limited the popularity of the 7mm RUM to dedicated long range enthusiasts. The RUM can be a lot of fun but its idiosyncrasies can lead to a level of frustration which eventually outweighs any benefits.  



Note: Recently, I discovered that a worn RUM can be revived. Please follow the link below to be re-directed to 'how to break in a rifle barrel'. At the bottom of this article is the stub article, 'Reviving a 7mm RUM'.



How to break in a rifle barrel

 

Suggested loads: 7mm RUM

Barrel length: 26”

No

ID

 

Sectional Density

Ballistic Coefficient

Observed  MV Fps

ME

Ft-lb’s

1

FL

Rem 150gr Scirocco

.266

.515

3325

3682

2

HL

160gr Partition

.283

.475

3275

3810

3

HL

160gr Speer Hotcor

.283

.504

3275

3810

4

HL

160gr Speer BTSP

.283

.519

3275

3810

5

HL

162gr SST

.287

.550

3275

3858

6

HL

162gr A-Max

.287

.625

3275

3858

7

HL

180gr VLD

.319

.684

3175

4028

8

HL

180gr VLD *

.319

.684

3175

4028

 

 

Suggested sight settings and bullet paths 

 

 

 

 

 

1

Yards

100

175

318

360

400

425

450

475

 

Bt. path

+3

+4.1

0

-3

-6.6

-9.3

-12.3

-15.7

2

Yards

100

175

309

351

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-5.2

-7.7

-10.7

-13.9

3

Yards

100

175

311

353

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-4.9

-7.4

-10.3

-13.5

4

Yards

100

175

312

355

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-4.8

-7.3

-10.1

-13.2

5

Yards

100

175

315

358

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-4.5

-6.9

-9.6

-12.7

6

Yards

100

175

318

361

400

425

450

475

 

Bt. path

+3

+4.1

0

-3

-6.4

-9

-11.9

-15.2

7

Yards

100

175

308

352

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-5

-7.5

-10.3

-13.3

8

Yards

100

175

315

357

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-4.5

-6.9

-9.6

-12.6

 

 

No

At yards

10mphXwind

Velocity

Ft-lb’s

1

400

8.7

2578

2214

2

400

9.7

2479

2184

3

400

9.1

2522

2258

4

400

8.8

2542

2294

5

400

8.2

2580

2394

6

400

7.2

2658

2540

7

400

6.8

2620

2742

8

400

6.8

2620

2742

 

Notes: Loads 2, 3, 4 work well in finicky rifles. Load No 4 duplicates trajectory of 162gr Interlock, another good economical, hard hitting load.  * indicates a load with scope set at 1.8” high.




 



 

 

Imperial

Metric 

A

.534

13.56

B

.550

13.97

C

30deg

 

D

.525

13.3

E

.322

8.17

F

2.387

60.62

G

.287

7.28

H

2.850

72.39




Link to the above article:www.ballisticstudies.com/Knowledgebase/7mm+Remington+Ultra+Magnum.html



Reviews:




Please remember to use the affiliate links for Amazon and Brownells from the Webpage  it really does help the show and the network.



Patreons 

  • New Patreons: Nick M

  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K,Vic T., Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

  • RLP pledge link



Thank you for listening.




How to get in contact with us:

Google Voice # 608-467-0308

Reloading Podcast website.

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Reloading Podcast on MeWe

Reloading Podcast on Gun Groupie

The Reloading Room 

Mike Iselin on Facebook

Jim Fleming on Facebook

Jason Trumbo on Facebook

Travis Buck on Facebook

Buckeye Targets

Jeremy Rowland on Facebook

Trevor Furlotte on Facebook

SlamFire Radio on Facebook




Source: https://firearmsradio.tv/reloading-podcast

Reloading Podcast 278 - Starline brass and shell holders

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang are talking to Starline Brass.  They also have a conversation about shell holders

  1. Starline

  2. Starline videos

  3. Redding Competition Shellholders





Cartridge corner:7mm Remington Ultra Magnum  

@Russ Brumbelow: We covered the 6mm Rem caliber in Episode 257


History  


Inspired by the Lazzeroni proprietary cartridges, Remington introduced the 7mm Remington Ultra Magnum in 2000. The 7mm RUM is based on the .300 Remington Ultra Magnum (1999) which is in turn based on a grossly modified version of the unbelted 404 Jeffery’s case. The RUM was designed to produce ultra high velocities to meet the growing demand for long range hunting rifles and cartridges.


Since its introduction, the 7mm RUM has achieved a mild following among long range hunting enthusiasts. That said, it is a chambering which hunters generally eventually move away from due to short barrel life.

 

Performance


From a 26” barrel, the 7mm RUM typically achieves 3450fps with 140 grain bullets, 3275fps with 160-162 grain bullets and 3175fps with 175-180 grain bullets. Velocities ‘should’ in theory be higher than the 7mmSTW which has the same case length but a much narrower body resulting in less case capacity. Nevertheless, the law of diminishing returns relative to overbore capacity dictates that the RUM only achieves around 30fps higher velocity than the STW when both are hand loaded to optimum potential.

 

Ultimately, only so much energy can be pushed through a 7mm orifice. A car engine is no different, a small 4 cylinder engine can only produce x amount of energy based on its cylinder bore capacity. Regardless of advanced methods of forced carburation, beyond a certain point, the engine suffers excessive wear, the valves burn out, bearings cannot take stress loads and so forth. The 7mm RUM is identical to a high performance race engine in every sense.

 

To optimize performance of the 7mm RUM, Remington engineers produced a chamber design utilizing .400” (10mm) free bore. This free bore acts as a gas expansion chamber, maximizing velocity due to a longer pressure curve. The case itself is designed for a working pressure of 65,000psi however, brass is brass and case life is not that high.

 

Due to the long free bore, bullets featuring short bearing surfaces must go through a phase during firing where the bullet is neither engaged in the case neck, nor guided by the rifling, literally free of control. Often, projectiles engage the rifling slightly off center resulting in poor accuracy. Some rifles appear to be forgiving of bullet design, producing acceptable accuracy with 162-168 grain bullets while others are only capable of producing optimum accuracy with either the 175 grain SMK or 180 grain VLD, neither of which are available as factory loads.

 

Custom, short throated 7mm RUM’s can and do produce extremely dangerous pressures with mild loads (89 grains powder). Such configurations generally have to be loaded to exactly 65,000psi pressures tend to be in the region of 70- 80,000psi when the cartridge is loaded both below and above optimum pressure having a window of only one or two grains powder leeway. To this end, it is most in-advisable to adopt a short (.200”) free bore configuration.

 

Barrel life of the 7mm RUM is extremely short due to hot gas erosion which occurs at the start of the rifling, the carefully cut leade which guides the projectile into full engagement of the bore. Used in the same manner as a standard hunting or target cartridge, barrel life is generally approximately 600 rounds. Barrel life can be extended up to and beyond 1000 rounds by allowing the RUM to cool to ambient temperatures between shots and cleaning (powder residues only) between 3 shot strings, however in the field this is often impractical. A few die hard fans of overbore cartridges insist on minimal practice and minimal field usage as the key to long barrel life in the Ultra Magnums however, any placed competitive shooter would suggest, that the key to successful shooting at long range is practice and not with a different rifle/cartridge.

 

The Remington factory rifle barrel contours and lengths are also detrimental to the performance of the 7mm RUM. The M700 SPS has a light contour barrel which overheats quickly and is too short at 26” for optimum performance. The 7mm RUM is better served with a heavy contour barrel of a minimum 28”, driving 180 grain bullets at 3200-3250fps. Remington do produce one heavy barreled rifle, the Sendero, but with a 26” barrel. These factors are unfortunately market driven.

 

Difficulties aside and where accuracy allows, the 7mm RUM is an outstanding performer on medium game, producing absolutely emphatic kills out to 800 yards and clean kills out to and beyond 1000 yards at which range speed of killing is dependent on target resistance to aid bullet expansion. The one limiting factor, is that at point blank ranges, the 7mm RUM often fails to generate hydrostatic shock, resulting in dead running game. This type of performance can be a major frustration to mountain hunters, losing dead run game to ravines.


 Factory Ammunition


Remington factory loads include the 140 grain Core-Lokt Ultra at 3425fps, the 150 grain Swift Scirocco at 3325fps and the 175 grain A-Frame at a mild 3025fps. Unfortunately, Remington do not produce a load capable of producing fast, clean killing at long ranges.

 

The 140 grain Core-Lokt Ultra has replaced Remington’s initial load for the RUM featuring the 140 grain traditional Core-Lokt which surprisingly, managed to hold together at RUM velocities and produce excellent performance on lighter medium game. The new core bonded bullet is better suited to a wider range of body weights and to some extent, less prone to producing excessive meat damage. BC of the Ultra is .409 which is of curse counterproductive to the design premise of the RUM however; this bullet produces fast killing out to 350 yards.

 

Remington’s 150 grain Scirocco load is a spectacular performer on medium game, producing best results inside 400 yards (2600fps) and clean but slightly delayed killing as velocities approach and fall below 2400fps, having the same limitations as all core bonded bullet designs. The 150 grain Scirocco is adequate for use on deer weighing up to 150kg (330lb) but can tackle heavier animals, especially as velocity approaches 2600fps and below. The 175 grain A-Frame is an excellent bullet for tough, heavy bodied game. Again, as has been re-iterated throughout the 7mm texts, regardless of muzzle velocities, the 7mm bore produces limited wounding on large heavy animals. The A-frame produces cross body penetration on large, heavy bodied game but hunters should always be mindful of the  limitations of the caliber.

 

Hand Loading

 

Brass for the 7mm RUM is available from both Remington and Nosler. Suitable powders include H1000, Retumbo, H50BMG while US 869 is perhaps the optimum powder for this cartridge. Bulk density is a concern when hand loading the RUM and both H1000 and Retumbo can sometimes pose problems due to under filling, causing high shot to shot velocity deviations which greatly reduce accuracy beyond 600 yards. These powders must be loaded to full pressures to produce optimum results. At the other extreme, H50BMG is extremely course, much the same as short grain rice and full velocities are only achieved with compressed or near compressed loads. Due to its course nature, H50BMG has the potential to cause significant abrasion within the throat area of the bore. U.S 869 suffers none of the above problems.

 

From a 26” barrel, the 7mm RUM produces 3450 with 140 grain bullets, 3350fps with 150 grain bullets, 3300fps with 154 grain bullets, 3275fps with 160-162 grain bullets, 3220fps with 168 grain bullets and 3150 to 3175fps with 175-180 grain bullets. 


Although the 7mm RUM can achieve sizzling velocities of 3450 to 3500fps with 140 grain bullets, most produce fairly slow killing at close ranges. On impact, the hide of thin skinned game becomes as hard as bone. Entry wounding is violent however, having lost much energy against the hide, eliminating any potential shock transfer, the animal remains conscious throughout this trauma. The animal may run anywhere from 25 to 100 yards before succumbing to blood loss.


In the 7mm RUM, the only truly reliable 140 grain bullets are the Partition and core bonded designs which include the 140 grain Accubond and 139 grain InterBond. Even the well constructed 139 grain SST fails to produce emphatic killing when used on light bodied game inside 100 yards. At longer ranges, conventional 140 grain bullets produce more uniform performance however the throat erosion caused by high powder charges and excessive heat outweighs all benefits. Bullet jump and loss of concentricity is yet another problem.


150 grain conventional bullets produce much the same results as the lighter 140 grain bullets in the 7mm RUM. Again, bullet to bore concentricity is often lost during ignition while performance on game is less than spectacular at close ranges. Of the conventional bullet designs the 154 grain SST will sometimes produce acceptable long range accuracy and fast killing. This bullet works well alongside the 154 grain InterBond as a dual loading, the SST for long range work, the IB for close range hunting.


The 160-162 grain bullet weight is realistically the lightest bullet weight suitable for the RUM regarding both accuracy and killing. Two very forgiving bullet designs are the 160 grain Speer Hotcor and Speer BTSP.  These bullets tend to produce excellent accuracy in the 7mm RUM and can be adapted to hunting light to medium weight game, the Hotcor for close range work, the BTSP for longer range work. The BTSP has a BC of .519 which is not exceptionally high but from a muzzle velocity of 3275fps, produces clean killing out to 740 yards.


Hornady produce three very good projectiles, the 162 grain BTSP, the 162 grain SST and the 162 grain A-Max. The 162 grain BTSP Interlock is a basic bullet suitable for hunters on a limited budget. This bullet is extremely effective and spectacular on lighter medium game, producing faster kills at close ranges than other conventional bullet designs driven at velocities above 3200fps. BC is .514 and the Interlock tends to produce best performance at impact velocities above 2200fps (600 yards) but is adequate out at 720 yards as velocity approaches 2000fps.


The 162 grain SST is one of the best bullets available for use in the RUM. Its only limitation is at point blank ranges where it occasionally fails to impart hydrostatic shock due to the increased target resistance associated with ultra high velocity, though wounding is thorough and killing usually only slightly delayed. At 3100fps (90 yards), the SST comes into its own, rendering wide wounds and exit wounds of up to 3” in diameter on medium sized game. The 162 grain SST is not well suited to heavy bodied game at close ranges but at long ranges, beyond 600 yards, this bullet is perhaps the optimum choice for large bodied game. BC of the SST is .550 and although this is lower than the likes of the A-Max, this bullet should not be over looked as it offers performance which other bullet designs cannot duplicate. Maximum effective range for the SST is up to and beyond 1000 yards depending on target resistance.


The 162 grain A-Max is an excellent hunting bullet. As has been reiterated throughout the 7mm magnum texts, its one limitation is that if used at close range on large bodied medium game, wounding can be shallow with shoulder shots. As an all-round load, the A-Max must be used with care. With time and experience, the A-Max can be used to great effect not only for dedicated long range hunting, but as a general purpose medium game load. As a long range hunting bullet, the A-Max has no peer, no other bullet is able to produce the same level of consistently wide wounding at velocities as low as 1400fps, equating to a whopping 1450 yards in the 7mm RUM.


Nosler’s 160 grain Partition and 160 grain Accubond are both good performers in the RUM. The RUM chamber design seems to work very well with the Partition and in some instances, the Partition can produce greater accuracy than 160-162 grain boat tail bullet designs. Although the Accubond has a high BC of .533, the Partition is the more violent of the two at all ranges. Both are good projectiles for use on larger bodied medium game however for both light and heavy bodied medium game, the Partition is a much more spectacular killer. That said, the Accubond produces much less meat damage. The Accubond tends to produce fast killing inside 360 yards with a reduction in speed of killing as it falls below 2600fps. The Partition continues to produce wide wounding out to ranges of around 675 yards (2000fps), producing emphatically fast kills at intermediate ranges.


Berger’s 180 grain VLD is extremely well suited to the long bullet jump of the 7mm RUM, producing optimum accuracy. Performance on game at both close and long ranges out to 1000 yards is outstanding and the 180 grain VLD can tackle a wide range of game weights. 


Note: Update 1 Jan 2011. Berger have recently thickened the Jackets on the VLD line of projectiles due to concerns from hunters that the VLD was suffering mid air bullet blow up (perhaps due to aggressive twist rates in custom rifles?). The new 180 grain VLD is very stout and can produce pin hole wounds on light bodied game at all ranges, regardless of ultra magnum velocities. This problem can be minimized by annealing the ogive. Place the VLD projectile in a pan of water with only the ogive exposed and heat the ogive with a blow torch duplicating the traditional method for annealing brass. The annealing should be aggressive, as to cause a permanent color change. Accuracy is unaffected providing care is taken. When used un-annealed, the new style 180 grain VLD is more suited to heavy bodied medium game at extended ranges, filling its own niche.

 

Closing Comments


The high cost of ammunition coupled with excessive throat erosion/ limited barrel life has limited the popularity of the 7mm RUM to dedicated long range enthusiasts. The RUM can be a lot of fun but its idiosyncrasies can lead to a level of frustration which eventually outweighs any benefits.  


Note: Recently, I discovered that a worn RUM can be revived. Please follow the link below to be re-directed to 'how to break in a rifle barrel'. At the bottom of this article is the stub article, 'Reviving a 7mm RUM'.


How to break in a rifle barrel

 

Suggested loads: 7mm RUM

Barrel length: 26”

No

ID

 

Sectional Density

Ballistic Coefficient

Observed  MV Fps

ME

Ft-lb’s

1

FL

Rem 150gr Scirocco

.266

.515

3325

3682

2

HL

160gr Partition

.283

.475

3275

3810

3

HL

160gr Speer Hotcor

.283

.504

3275

3810

4

HL

160gr Speer BTSP

.283

.519

3275

3810

5

HL

162gr SST

.287

.550

3275

3858

6

HL

162gr A-Max

.287

.625

3275

3858

7

HL

180gr VLD

.319

.684

3175

4028

8

HL

180gr VLD *

.319

.684

3175

4028

 

 

Suggested sight settings and bullet paths 

 

 

 

 

 

1

Yards

100

175

318

360

400

425

450

475

 

Bt. path

+3

+4.1

0

-3

-6.6

-9.3

-12.3

-15.7

2

Yards

100

175

309

351

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-5.2

-7.7

-10.7

-13.9

3

Yards

100

175

311

353

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-4.9

-7.4

-10.3

-13.5

4

Yards

100

175

312

355

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-4.8

-7.3

-10.1

-13.2

5

Yards

100

175

315

358

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-4.5

-6.9

-9.6

-12.7

6

Yards

100

175

318

361

400

425

450

475

 

Bt. path

+3

+4.1

0

-3

-6.4

-9

-11.9

-15.2

7

Yards

100

175

308

352

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-5

-7.5

-10.3

-13.3

8

Yards

100

175

315

357

375

400

425

450

 

Bt. path

+3

+4.1

0

-3

-4.5

-6.9

-9.6

-12.6

 

 

No

At yards

10mphXwind

Velocity

Ft-lb’s

1

400

8.7

2578

2214

2

400

9.7

2479

2184

3

400

9.1

2522

2258

4

400

8.8

2542

2294

5

400

8.2

2580

2394

6

400

7.2

2658

2540

7

400

6.8

2620

2742

8

400

6.8

2620

2742

 

Notes: Loads 2, 3, 4 work well in finicky rifles. Load No 4 duplicates trajectory of 162gr Interlock, another good economical, hard hitting load.  * indicates a load with scope set at 1.8” high.



 


 

 

Imperial

Metric 

A

.534

13.56

B

.550

13.97

C

30deg

 

D

.525

13.3

E

.322

8.17

F

2.387

60.62

G

.287

7.28

H

2.850

72.39




Link to the above article:

www.ballisticstudies.com/Knowledgebase/7mm+Remington+Ultra+Magnum.html

 


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Reloading Podcast 277 - Lockrings

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang are talking Lockrings.

  1. I have a question I'd like to hear answered on the podcast. I usually use Rcbs dies. But sometimes the brass set screw in the lock nut either fails or gets stripped out. So I'll replace them with a Hornady lock nut that tightens with a allen screw that compresses the split lock nut around the die.  So my question is two fold. First, why is it that when I tighten the Allen screw in the lock nut, the lock nut seems to tighten down into the press? Once it tightened down so much that when I used a wrench to loosen the die the black threaded sleeve that rests inside the rock chucker press I use came out with the die instead of the die coming out of the press.  My second question is, does using the Hornady style lock nut have the potential to squish the die out of round and cause concentricity issues or have other negative effects that might degrade accuracy?





Cartridge corner: none this week


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Reloading Podcast 274 - how short is too short?

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is talking safety, and making your own “tracers”.

  1. Stop the Bleed 

  2. Great podcast have a question for you. Have a new Taurus G2C and the reloads I have used for year in other 9mm will not feed 125 gr powder-coated  C0L of 1.09 Will not go into battery. Had to go to 1.06 before I got a reliable feed any thoughts


Thanks John

  1. D. Posted “Admins a what products have you found are best? Smokeless powder, bullets, cartridges, and primers - what are the better sites to order from and best kinds to use? I’ll be reloading 9mm and 223s. “

  2. I just listened to 272, I powder coat and also tumble lube.  I have played around with the glow in the dark bullet idea and it is very easy to do.  All you have to do is paint the back of the bullets with glow in the dark paint. I had success with 9mm, 357mag, 38spl.  I tried 223 and was not successful. Due to speed and lack of surface area. The flash of the powder charges the bullet for about three seconds. Not long but the bullet is moving fast enough to overcome that short window of time. It turns the rounds into non incendiary tracers. Similar to the popular streak ammo. The rounds cannot be seen from the side or front. Due to the paint only being present on the base of the bullet. Meaning that the shooter and people close behind will be the only ones to see the streak. Giving a tactical advantage over traditional incendiary tracers. Gannon






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  • Current Patreons: Aaron R, Aaron S, AJ, Alexander R, Anthony B, Bill N, Mr. Anonymoose, bt213456, Carl K, KC3FHH, D MAC, David S, Drew, Eric S, Gerrid M, Gun Funny, Jason R, Joel L, John C, Kalroy, Alexander R., Jason R. Ken C, Richard K, Brewer Bill, Mark H, Mark K,Vic T., Billy P., Matthew T., michael sp, Mike St, Mr. Attila the Hun, Patch Rat, N7FFL, Peter D, Richard C, Russ THE BIG BORE Russ H, T-Rex, Tim A, Tony S, Troy S, Winfred C

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Reloading Podcast 273 - Chat questions abound

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the guys are answering chat questions.

  1. I just bought a used like new gen 1 TC Contender. I sold the 223 barrel it came with to buy a 7-3O waters barrel. I think this cartridge would be great for deer.  My question is about forming cases. I know I can take 3030 cases and resize with 7-30 dies and fire a light charge/bullet to blow out the shoulder. However, I thought I heard him say there is a technique that doesn’t require sending a bullet down the barrel. I just can’t remember what he said. Did it involve unique and wax plug? Thanks, Jon

  2. https://imrpowder.com/resources/data-sheets/

  3. Lead hardness





Cartridge corner:.270 Weatherby Magnum

History


The .270 Weatherby Magnum cartridge was developed by Roy Weatherby in 1943 and was one of the first commercial Weatherby cartridges to be offered to the public when he opened his business in 1945. The .270 is one of a family of Weatherby Magnums which share a 2.545” (64.64mm) length case. These include the .257, .270 and 7mm Weatherby Magnum cartridges. The .300 Weatherby Magnum has a longer case length of 2.825" (71.76mm). 


As with most of the Weatherby line of cartridges, the .270 gained a small but staunch following which has remained static to this day, regardless of new inventions such as the .270WSM. The .270 WBY is a favorite cartridge of Australian gun writer Nick Harvey for use on all game up to the size of Elk. Harvey has harvested a great number of game, including African plains game, using the 130 grain Barnes TSX.

 

Performance


As can be expected, the .270 WBY is a powerful, flat shooting, hard hitting cartridge. The Weatherby is not a specialized cartridge, regardless of its unique case design but rather, an excellent all-round medium game cartridge blessed with mild recoil (for a magnum).


Loaded with 130 to 150 grain bullets, the .270 WBY produces high shock for fast killing out to ranges of around 325 yards. Broad wounding continues out to around 450 yards after which, wound channels are more proportionate to caliber. Unfortunately, no manufacturer currently produces a wide wounding match style projectile in .277” caliber specifically for long range hunting at ranges beyond 500 yards. 


The .270 Weatherby is absolutely ideal for light to medium weight game. On larger animals such as Elk, bullet choice has a huge effect on results. Using a bullet of sound construction, the Weatherby is able to render wide, fast bleeding wounds and free bleeding exit wounds on game weighing as much as 320kg (700lb). The .270 WBY is adequate for heavier species of game but certainly not as emphatic as something in the class of the .340 WBY.


 

 

Factory Ammunition


Weatherby list one varmint load featuring the 100 grain Hornady soft point at a throat melting velocity of 3760fps. Other Weatherby factory loads include the 130 grain Hornady Interlock at 3375fps, the 130 grain Nosler Partition also at 3375fps, the 130 grain TSX at 3400fps, the 140 grain Nosler Ballistic Tip at 3300fps, the 140 grain Accubond at 3320fps, the 150 grain Hornady Interlock at 3245fps and finally, the 150 grain Partition, also at 3245fps. All of these loads are chronographed in 26” barrels. Velocities in sporting rifles tend to range from 100fps below advertised to within 20fps.


At 3275 to 3375fps, the 130 grain Interlock is not a particularly good performer on medium game at close ranges due to bullet blow up. Nor does the Interlock produce a necessarily wide wound channel during bullet blow up due to its tendency to disintegrate into dust, rather than larger fragments. This load is best utilized on game weighing no more than 60kg (130lb). The 130 grain Partition is a slightly better all-rounder but is still put under a great deal of stress at close range, best suited to game no heavier than 80kg (180lb) for optimum performance. 


The 130 grain TSX loaded to Weatherby velocities produces outstanding results. The combination of a high muzzle velocity plus a good BC, enables the TSX to produce high shock out to 400 yards (2600fps). There is a definite cut off point in performance when the TSX falls below 2600fps and rear lung shots often result in very slow kills, especially on light or lean animals. Nevertheless, this Weatherby load extends the ‘versatile’ or ‘shot placement forgiving’ range of the TSX out to a distance that is as far as many hunters are willing to shoot. This a good load for all game up to the size of, and especially suitable for, Elk.


Weatherby’s two 140 grain loads are also very useful. The Accubond and BT both have a similar form and will almost always shoot to the same POI. The 140 grain Accubond opens quickly on light game, causes immediate collapse with ordinary shoulder shots and renders a large wound channel. On heavy animals such as Boar or Elk, the Accubond will not exit from cross body shoulder shots, wounding is broad but the Accubond cannot be expected to produce optimum performance with heavily raking shots. The BT almost always suffers bullet blow up at close ranges. This projectile is stouter than the 130 grain Hornady but at close ranges, is still best limited to use on lighter animals. As Ranges exceed 200 yards, the BT performs well on a variety of game up to 80kg (180lb) and continues to produce wide wounding out to around 500 yards.


The 150 grain Hornady Interlock really is a spectacular game bullet however it is not in anyway a stout, deep penetrating projectile. Like the Ballistic Tip, this projectile is best suited to game weighing up to 80kg as a safe maximum. On heavy bone the Interlock is prone to total disintegration. The Interlock is definitely a more spectacular, emphatic killer on light framed animals than the BT or similar conventional style projectiles.


Federal list three loads for the .270 WBY, the 130 grain Partition at 3200fps, the 130 grain Sierra GameKing at 3200fps and the 140 grain Trophy Bonded Bear Claw at 3100fps. These are fairly mild loads but are nevertheless useful. Both the Sierra and Nosler bullets will in most cases shoot to the same POI out to ranges exceeding 300 yards. The BC of both bullets is similar, regardless of the flat base of the Partition versus the boat tail GameKing design. Both Vertical and Horizontal dispersion between loads is either non existent or minute. The 130 grain Sierra is a hand grenade on light game at close to moderate ranges, disintegrating into fragments of copper and lead. The Partition is also a violent killer but does so without bullet blow up and produces noticeably deeper penetration. To this end, Federal sell the GameKing load at a cheaper price. Both the Partition and GameKing readily expand at low velocities of 2200fps.


The Trophy Bonded Bear Claw is similar to the Barnes TSX in design but different in performance. The TBBC has a wider meplat and soft lead frontal core. The BC of the TBBC is fairly low, a reflection of the singular goal towards optimum terminal performance within “traditional” moderate hunting ranges. The TBBC opens extremely quickly, renders a violent wound channel but also produces deep penetration. The higher the impact velocity or the heavier the bone, the more violent the wound. Like the TSX, this projectile does its best work at impact velocities above 2600fps which in this loading, equates to a range of 200 yards. Beyond this range kills are clean but slightly delayed, becoming much slower at 280 yards or 2400fps.

 

Hand Loading


There is little difference in powder capacity between the .270 WBY, the 7mm WBY and the 7mm Remington magnum. The latter has a slightly shallower shoulder angle and is shorter in the neck by a meager 60 thou (1.25mm). Nevertheless, Weatherby chambers feature generous free bore which allows for long peak chamber pressures, resulting in higher obtainable velocities.


From the factory ammunition COAL of 3.280” (83.3mm), bullet jump to the lands is approximately .375" (9.525mm). The hand loader can theoretically seat bullets closer to the lands but it is impossible to seat bullets within 40 thou (1mm) of the lands due to loss of concentricity. Regardless of free bore, properly tuned Weatherby rifles will normally shoot a variety of projectiles with acceptable to excellent accuracy.


The most suitable powders for the .270 WBY are the slow burners, especially H1000 (ADI2217), IMR7828 and N170. From 26” barrels, maximum safe working velocities include 3400fps with 130 grain bullets, 3300fps with 140 grain bullets and 3200fps with 150 grain bullets.


A few years ago there were very few projectiles capable of producing optimum performance in the .270 WBY, now there are several outstanding bullet designs. As with many high power cartridges of this type, a good rule of thumb for choosing bullets is to adopt either “light but stout” or “heavy but soft” projectiles. Of the two styles, generally speaking, the heavy but soft bullets tend to be the most versatile loads on medium game due to more uniform performance at longer ranges.


Examples of the light but stout bullets include the 130 grain InterBond, 130 grain Scirocco, the 130 grain Accubond and 130 grain Barnes TSX. Of these, the core bonded bullets are a little more emphatic on lean game at longer ranges of between 300 and 400 yards while the TSX is much more thorough on larger animals. The mid weight 140 grain Accubond is a good projectile, as already mentioned.


Examples of heavy but soft projectiles which produce reliable performance include the 150 grain Hornady SST, the 150 grain Nosler Partition and the 160 grain semi point Partition. Each have their strengths and all are outstanding medium game projectiles. The SST, once annealed (see 7mm Rem Mag), is a versatile all-rounder, working very well at both close and extended ranges on mid weight deer species. This is a violent and hard hitting bullet that is worlds apart from its 130 grain counterpart. The 150 grain Partition is extremely useful on game weighing up to 150kg (330lb) while being perfectly adequate for Elk sized game. The 160 grain Partition is extremely underutilized, being ideal for a wide range of body weights and coming into its own on to Elk sized animals. Both produce emphatic results down to impact velocities of 2200fps and are adequate to impact velocities of 1800fps. Performance of the Partitions and 150 grain SST cannot be under stated. Three extremely useful projectiles.

 

Closing Comments


The .270 Weatherby continues to maintain a steady following, regardless of new inventions such as the WSM’s. The Weatherby is an emphatic killer of light to larger medium game and does so without producing horrendous recoil - two factors which will ensure it remains popular for many years to come.

 

Suggested loads: .270 Weatherby Magnum

Barrel length: 26”

No

ID

 

Sectional Density

Ballistic Coefficient

Observed  MV Fps

ME

Ft-lb’s

1

FL

WBY 130 TSXBT

.244

.466

3400

3336

2

FL

WBY 140gr Bal Tip

.261

.456

3300

3385

3

FL

WBY140gr Accubond

.261

.496

3320

3425

4

FL

WBY150gr Partition

.279

.465

3245

3507

5

HL

130gr Hornady InterBond

.244

.460

3400

3336

6

HL

150gr Berger VLD

.279

.532

3200

3410

 

Suggested sight settings and bullet paths 

 

 

 

 

 

1

Yards

100

175

327

370

400

425

450

475

 

Bt. path

+3

+4.2

0

-3

-5.7

-8.3

-11.2

-14.4

2

Yards

100

175

312

355

375

400

425

450

 

Bt. path

+3

+4

0

-3

-4.8

-7.3

-10.2

-13.4

3

Yards

100

175

318

360

375

400

425

450

 

Bt. path

+3

+4

0

-3

-4.2

-6.6

-9.3

-12.3

4

Yards

100

175

306

345

375

400

425

450

 

Bt. path

+3

+4

0

-3

-5.4

-8

-11

-14.3

5

Yards

100

175

327

370

400

425

450

475

 

Bt. path

+3

+4.2

0

-3

-5.7

-8.3

-11.2

-14.5

6

Yards

100

175

306

345

375

400

425

450

 

Bt. path

+3

+4

0

-3

-5.4

-7.9

-10.8

-14.1

 

 

No

At yards

10mphXwind

Velocity

Ft-lb’s

1

450

11.4

2520

1834

2

450

12.2

2422

1823

3

450

11

2503

1947

4

450

12.2

2392

1906

5

450

11.6

2510

1819

6

625

21.6

2192

1601


Note: Load No.6 shows retained velocity at 625 yards as an insight to velocities.

 

 


 

 

Imperial

Metric 

A

.531

13.50

B

.512

13.00

C

R.151

 

D

.492

12.50

E

.303

7.70

F

2.068

52.55

G

.397

10.08

H

2.549

64.74

Max Case

2.549

64.74

Trim length

2.539

64.49


Discuss this article or ask a question on the forum here


Copyright © 2007-2011 Terminal Ballistics Research, Ballisticstudies.com 


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Reloading Podcast 272 - Electronic, paper, or stone tablets?

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the gang is talking more about data storage.

  1. Greetings gents, I just finished listening to episode 269 and had a couple thoughts.  In regards to Travis's affection for written data I have this thought. Digital is today's standard, and I research loads in dead tree manuals as well as online resources; however, I always keep my recipes in a Reloaders Logbook. Why? Let answer by way of illustration. My family has in photo albums pictures of great grandparents and other family that I never knew. But old, yellowed black and white photos are still around. They survived two world wars, the depression, have been in attics and basements and still look pretty good. Our digital goods can be gone in an instant with a lightning strike. Our backups can be gone due to degraded media, or our backups may no longer be readable because we don't have a device to read them (Floppy? ZipDrive? JazzDrive? LS120 SuperDisk?) . Or suppose file formats or filesystems fall out of favor? Ever used Quattro or Lotus for spreadsheets? Could you even open those files today? At this point saving data as comma separated values text files to the cloud seems sufficient, but tech companies do go out of business or spin off divisions to other companies that may jettison your files like digital flotsam.  So I'm going with Travis on this one. It is a prudent approach, I believe, to write things down on paper. The written word, whether on paper, parchment or stone tablets (Jim?) clearly has history on it's side.  As far as the reviewer recommending ditching the Cartridge Corner, I vote NO. As a K.O.O.K, a Keeper Of Odd Knowledge, I find it interesting to hear about some of the lessor known cartridges that have come before and the parent case of some of our mainstay cartridges and how the variants solved a particular shortcoming or improved performance for a specific or perceived need.  Thank you guys for the education and mentoring. I don't use iTunes or Stitcher, but I gave a review over on Podcast Republic where I get my podcasts. Regards, Richard 

  2. Curious, does anyone have a picture of a perfect crimp? I am adjusting my seater die for a .30-30 win, and want to be sure to give enough crimp. How can I tell when I have enough crimp? Not enough crimp? I can mic the brass thickness, mic the bullet, and mic the outside diameter to figure out neck tension, but what is the ideal tension. I hand load for numerous bottle necks but the requirement of crimping is new to me. Scott C.





Cartridge corner:none


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Reloading Podcast 271 - bolt vs semi revisited

Hello, and welcome to the Reloading Podcast here on the Firearms Radio Network.  

Tonight the guys are talking a bit more about bolt vs semi.

  1. What is the name of Phil’s podcast?

  2. Hi guys,To your discussion the other day on accuracy of an AR15 vs a bolt gun. Never heard of a bench rest shooter using an AR15. I have an experiment for you all. Does the COL change when the bolt slams shut? This is the same way a bullet puller works. And if no crimp is applied will the “feed ramp” move the bullet? I hade a 6.8 spec bullet pushed back in the case. It was un crimped reduced load. I believe on a normal load (100% density) the powder would keep this from a curing. I will never load for an auto loader and not crimp. Thanks and keep up the good work. Jr.

    1. Case mouth and Neck Tension gage

    2. Primer pocket go no go

  3. I’m a new listener and I’m really enjoying your podcast. I started listening about a month or so ago. I started on episode 232 and have been playing catch-up and I’m now up to episode 251. At the end of episode 243 you were talking about where everyone was from. I believe it was Jim (I don’t know everyone’s name by voice yet) who said he was from Pennsylvania and moved to North Carolina. I just recently moved to Northern Virginia from Oregon and I’m having a hard time finding a good reloading shop. I don’t know if he is familiar with or knows any good shops being from the area. Any and all suggestions would be appreciated. Thanks for your time and Keep up the good work! Palm

  4. Hello everyone and just wanted to say I’m new to the podcast, but so far you guys are doing a great job! Very useful information and great topics. I have always casted bullet then used liquid alox, but after hearing Travis give the used car lot salesmen’s speech of powder coat, I’d figure why not give it a go, so my question is when would Jim make the amazing transition from alox to powder coat? I did and I wondered why I have not started powder coating sooner! Thanks guys and keep up the good work! - Lupe from California






Cartridge corner:Cartridge corner:The 7.65×53mm Mauser (designated as the 7,65 × 53 Arg. by the C.I.P.)[2] is a first-generation smokeless powder rimless bottlenecked rifle cartridge developed for use in the Mauser Model 1889 rifle by Paul Mauser of the Mauser company. It is also known as 7.65×53mm Argentine, 7.65×53mm Argentine rimless, 7.65mm Argentine, 7.65×53mm Belgian Mauser or 7.65mm Belgian (in the United States) and 7.65×53mm Mauser (in Belgium).

The 7.65×53mmR is a rimmed variant of the 7.65×53mm Mauser cartridge.[citation needed] Ballistically it is comparable to the also-rimmed .303 British cartridge.[citation needed]

Contents

History[edit]

The 7.65×53mm Mauser was the result of considerable experimentation by Paul Mauser to optimize the bullet diameter for use with the new smokeless propellant introduced as Poudre B in the 1886 pattern 8mm Lebel that started a military rifle ammunition revolution.[3] At the time of its development it was a high-performance smokeless-powder cartridge.

This cartridge was loaded commercially by many manufacturers in the United States until about 1936.[1] Hornady is the only major U.S. ammunition manufacturer to still produce this cartridge. Sporting ammunition in this caliber is still loaded in Europe.[1] Norma, Prvi Partizan, and Fabricaciones Militares (FM) currently produce 7.65×53mm ammunition.[4] Boxer-primed cases are easily formed from .30-06 brass; resize and trim. For reloading the cartridge, use .303" British load data.

Cartridge dimensions[edit]

The 7.65×53mm Mauser has 3.70 ml (57.1 grains H2O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt action rifles and machine guns alike, under extreme conditions.

7.65×53mm Mauser maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).

Americans would define the shoulder angle at alpha/2 ≈ 22.2 degrees. The common rifling twist rate for this cartridge is 280 mm (1 in 11.02 in), 4 grooves, Ø lands = 7.65 mm, Ø grooves = 7.92 mm, land width = 4.20 mm and the primer type is large rifle.[2]

According to the official Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives (CIP) rulings the 7.65×53mm Mauser can handle up to 390.00 MPa (56,565 psi) Pmax piezo pressure. In CIP member countries every rifle cartridge combination has to be proofed at 125% of this maximum pressure to certify fit for sale to consumers. This means that 7.65×53mm Mauser chambered arms in CIP regulated countries are currently (2013) proof tested at 487.50 MPa (70,706 psi) PE piezo pressure.[2]

The American .308 Winchester cartridge is a close ballistic twin of the 7.65×53mm Mauser. The .308 Winchester being a post World War II cartridge developed by Winchester to provide similar performance in a short bolt action format.[citation needed]

Due to the cartridge case's dimensions, production of 7.65mm brass can be accomplished by reforming .30-06 Springfield cases. Simply resize and trim.

Military ammunition[edit]

Round-nosed 7.65×53mm Mauser ball ammunition

Spitzer 7.65×53mm Mauser ball ammunition

The original 1898 pattern military ball ammunition was introduced in the Mauser Model 1889 and loaded with a 13.65 grams (210.7 gr) round-nosed bullet fired at a muzzle velocity of 650 m/s (2,133 ft/s) with 2,884 J (2,127 ft⋅lbf) muzzle energy.

Following the lead of French and German army commands in developing the spitzer - a pointed-tip - bullet shape, later military ball ammunition was loaded with a 10.00 g (154.3 gr) spitzer bullet fired at a muzzle velocity of 830 m/s (2,723 ft/s) with 3,445 J (2,541 ft⋅lbf) muzzle energy from a 589 mm (23.2 in) long barrel became available. It had a maximum range of 3,700 m (4,046 yd).[5] Reverse engineering the trajectory from the previous sentence indicates a ballistic coefficient (G1 BC) of approximately 0.34.

After that military ball ammunition loaded with an 11.25 g (173.6 gr) spitzer bullet fired at a muzzle velocity of 725 m/s (2,379 ft/s) with 2,957 J (2,181 ft⋅lbf) muzzle energy from a 589 mm (23.2 in) long barrel became available. Besides a pointed nose this projectile also had a boat tail to further reduce drag. It had a maximum range of 5,000 m (5,468 yd).[5] Reverse engineering the trajectory from the previous sentence indicates a ballistic coefficient (G1 BC) of approximately 0.55.

Military use[edit]

At one time, the 7.65×53mm Mauser cartridge saw widespread military use. It was used by:

Chambered service weapons[edit]

Some of the Mauser rifles it was used in were the Model 1889, Model 1890, Model 1891, Model 1893, Model 1903, Model 1905, Model 1907, Model 1909, Model 1927, FN Model 1930, Vz. 32, Standardmodell 1933 and FN Model 1935. Other rifles included the Fittipaldi machine gun, Madsen machine gun and the FN Model 1949. In Argentinian military service, the cartridge was used from 1891 to the early 1970s in Mauser bolt-action military rifles, as well as a semi-automatic rifle, the FN-49, manufactured by Fabrique Nationale in Belgium.

References[edit]

  • Ball, Robert W. D. (2011). Mauser Military Rifles of the World. Iola: Gun Digest Books. ISBN 9781440228926.

External links[edit]

Wikimedia Commons has media related to 7,65×53 mm Argentino.

 


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