The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Guns, Politics, Gunsmithing & Reloading Gunsmithing 7x57 to 280 Reming CONVERSIONGo | New | Find | Notify | Tools | Reply | |
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Is this possible, just by using a chambering reamer? Or is there a "hidden" diameter on the Mauser chamber/case profile that makes the conversion impossible? I'm asking about conversion to a standard 280 Remington not to the "AI" or "Improved" version. Is it just as simple as say converting 8x57 to 8mm-06 appears to be? By that I mean similar to the hidden "diameter" that means one can't convert 243 Winchester to 244 Remington as there is an area on the 243 case wider than on the same point along the 244 Remington case. | ||
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I hope there's a hidden diameter there that keeps you from messing up a perfectly good rifle!  However, I don't know the answer to your question.Good hunting, Andy ----------------------------- Thomas Jefferson: “To compel a man to furnish funds for the propagation of ideas he disbelieves and abhors is sinful and tyrannical.” | |||
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The shoulder of the 243 is simply larger in dia than the 6mm. The 280 reamer will clean up a 7x57. The neck of the 7x57 can be just a touch larger in dia than the neck on the 280. You might see a slight ring after firing. If you do and it bothers you just open the neck up a touch. As usual just my $.02 Paul K | |||
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But, unfortunately, in 7x57 illegal to own or use in France or Belgium as it is a "military calibre"! | |||
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This is a good reply.....I'd ream it and go hunting /////////////////////////////////////////////////////////////////////////// "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." Winston Churchill | |||
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Ramrod is correct. If a standard 280 Rem reamer is run into a standard 7x57 and properly headspaced, there will be a remnant of the original neck that extends a little ways forward from the neck/shoulder junction of the new 280 chamber. To eliminate a step at this point, it's necessary to make the 280 Rem reamer with a neck tapered from approx. .323" at the neck/shoulder junction to .319" at the case mouth. This will clean up the old neck and allow reloading with standard dies. I wouldn't recommend leaving a remnant of the old neck because it CAN be in the form of a sharp corner at the case mouth of the old chamber. This sharp corner is a stress riser, and will eventually cause the new 280 brass to separate at this point DManson | |||
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In Rifle or Handloader Magazine about 25 years ago Ken Waters wrote about a nice Venezuelan Mauser he had rechambered. Against the smiths recommendation he left the ring in the neck and it caused the brass to to crack around the neck. | |||
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I posted on this in the Medium rifles section. I have had NO trouble with my Brno22H so modified and I note that Finn Aagard had one as well and shot it for years without a problem. My impresion is that contemporary brass WILL function well over several firings with this conversion. I will only do it to useful, but, non-pristine rifles, mine is a "roundbolt" 22H and this is a VERY desirable piece, but, the stock was toast and so I re-chambered it as the rifle was not original after repairs, anyway. You can get 200 fps more out of a 160NP in a 23-24"tube, the shorter bbls. co not seem to do as well in .280, so, I wouldn't bother. I have two 7x57s, but, I consider the .280 superior and this conversion is worth it, IMHO. | |||
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Thank you all for your help and comments...this really shows this forum at its best! Any further comments would also be welcomed. Do I take it that a 8x57 to 8mm-06 conversion won't have the same such problem with this "shoulder"? Are there problems converting 7x64 to 280 Remington also? | |||
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I have no first hand with the 8-06. I show the necks to be the same dia. Unlike the 280 it was not a factory round so I would ASSUME the neck dimensions 8-06 were set to the same as the 8x57 to allow it to clean up the neck. As I've tried to say it really isn't a "shoulder" per normal specs it would be .003" per side. I reloaded my brass at least three times without issue. Any smith should be able to correct it without setting the barrel back. If the thought is that the ring causes the brass to work harden along the line I would think annealing would help. As to the 7x64. While the neck is smaller in diameter than the 280 it is basically the same length. 2.52-2.54" so the ring would not be an issue. If for some reason it happened to show on the 280 case a trim to 2.52 should cure it and the rifle would never know the difference. As to whether the 280 would clean up the rest of the chamber I have never drawn it out. As usual just my $.02 Paul K | |||
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Hello Enfield: Coverting 8x57(S-bore) to 8mm-06 should cause no problems as long as the neck diameter of the 8mm-06 reamer is at least as large as the original neck of the 8x57. Converting a 7x64 to 280 Rem would require setting the barrel back one thread before cutting the 280 chamber. If this wasn't done, there would be a pronounced remnant of the original 7x64 shoulder just below the body/ shoulder intersection of the 280. I can see no advantage to this conversion other than being able to use cheaper brass. DManson | |||
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Basically my reason behind thinking about 7x64 to 280 also! | |||
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why not just go with 7x57 ackley just my $.02 james | |||
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Why not just leave it in 7X57 and use modern loads. There is not much difference if you load them both to the same pressure. | |||
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opinions vary band of bubbas and STC hunting Club Information on Ammoguide about the416AR, 458AR, 470AR, 500AR What is an AR round? Case Drawings 416-458-470AR and 500AR. 476AR, http://www.weaponsmith.com | |||
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Dave, good seeing you posting here. We can ALWAYS use your expertise here. Your brother Andy just finished a Martini Cadet in 218 Bee for me. It looks great! Don Buckbee | |||
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You could just get the barrel stamped 275 Rigby. Finding brass so marked might be a problem though. Leftists are intellectually vacant, but there is no greater pleasure than tormenting the irrational. | |||
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Hello Don: Thanks for the kind words. I'd be interested in how the Bee shoots--should be fun. Dave Manson | |||
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The money you save in not monkeying around with a 7X64 to get a 280 will buy a BUNCH of 7X64 brass and dies. I wouldn't bother at all since the 7X64 is not only a damn nice caliber, it's also much more common than the 280 once you get outside of Murka. Mike | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Guns, Politics, Gunsmithing & Reloading Gunsmithing 7x57 to 280 Reming CONVERSION
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