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Rifles, Reloading, Optics, Equipment
Reloading
New brass and pressure
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<blockquote data-quote="Mike Matteson" data-source="post: 2454739" data-attributes="member: 101791"><p>I had the same problem a great many years ago. It was in a 308 Norma Mag. The case length is somewhat different. The the shoulder it's shorter, neck length is longer. I resize 300 Win, and 7mm RM, and 338 WM to its chamber sizes. Was having case stretch problems in about 3 firing. Changed to 300 WM neck sizing die. Ended that problem. if I recall correctly I didn't have much problem with chambering either after that. It only sizers about 2/3 of the neck. Once fireformed no problems. Primer pockets were gone in about 12 firing. Annealing came into the picture about the same time. Stop the neck splitting. You kind of stop the case group by just bumping the shoulder. That were I would go. Peterson does make long 300 WM case. Have to watch when they come out again. I saw when they came out. Nothing on the market presently. I am going to get some the next time they are out for my 338 WM</p></blockquote><p></p>
[QUOTE="Mike Matteson, post: 2454739, member: 101791"] I had the same problem a great many years ago. It was in a 308 Norma Mag. The case length is somewhat different. The the shoulder it's shorter, neck length is longer. I resize 300 Win, and 7mm RM, and 338 WM to its chamber sizes. Was having case stretch problems in about 3 firing. Changed to 300 WM neck sizing die. Ended that problem. if I recall correctly I didn't have much problem with chambering either after that. It only sizers about 2/3 of the neck. Once fireformed no problems. Primer pockets were gone in about 12 firing. Annealing came into the picture about the same time. Stop the neck splitting. You kind of stop the case group by just bumping the shoulder. That were I would go. Peterson does make long 300 WM case. Have to watch when they come out again. I saw when they came out. Nothing on the market presently. I am going to get some the next time they are out for my 338 WM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
New brass and pressure
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