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#1
06-02-2022, 02:46 PM
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Cracked Masburn Bee shoulders.
Not too long ago I acquired a P.O. Ackley built 310 Cadet rebarreled in 218 Masburn Bee. Finding regular Bee brass was tough. Some of the brass is very old, some reformed from 25-20. As I fire form this brass with a not quite full (very accurate) load, I get about 40% split shoulders. I have not annealed any of the cases. Any advice from you old sages?
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#6
06-02-2022, 04:49 PM
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After you anneal, use a stiff load to fire form the cartridge shoulder completely with one shot. An accurate load can come later.
Having to do it twice with a lighter load only takes you back to the possibility of having to anneal again to keep the partially formed brass from splitting the second time around. -BCB
__________________
I miss mean Tweets, competence, and $1.79 per gallon gasoline. Yo no creo en santos que orinan. Women and cats will do as they please. Men and dogs should relax and just get used to the idea. Going keyboard postal over something that you read on the internet is like seeing a pile of dog crap on the sidewalk and choosing to step in it rather than stepping around it. If You're Afraid To Offend, You Can't Be Honest - Thomas Paine
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#7
06-03-2022, 06:53 AM
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Check the neck diameter of the chamber.
I had that problem with too tight a neck once. Every case split the neck when fired. There HAS to be enough opening there to allow the case to expand and release the pressure.
__________________
George "Gun Control is NOT about guns, it's about CONTROL!!" Last edited by georgeld; 06-04-2022 at 06:37 AM.
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#8
06-03-2022, 01:01 PM
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As you stated, some of it is very old brass. Probably was not annealed when it was load and has case hardened, from sitting so long, prior from you buying it. As others have stated anneal it and find or form some newer brass also, which I would guess you are doing anyway.
Enjoy the old girl and have fun. 
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#9
06-03-2022, 02:25 PM
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I was finally able to find some new (blue bag) Winchester .218 brass to form into Mashburn for my Cooper 38 almost 9 years ago. I read the forums as saw that many had shoulder splitting while fireforming, so I borrowed my buddies annealer and annealed the 300 new cases I had. Even with them being annealed I still lost more than a few cases to shoulder splits during fire forming even though I started with new annealed brass. I tried using different loads and powders to see if I could lessen the splits but nothing worked. Unfortunately the splits just kept happening as I went along and I ended up losing about 10%. I saved the cases thinking they might be useful and ended up turning them into short cases I could use for shooting heavy bullets in my original chambered .310 Cadet.
Last edited by Intel6; 06-03-2022 at 02:44 PM.
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