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Rifles, Reloading, Optics, Equipment
Reloading
Neck Sizing Vs. Full Length Sizing and Neck Tension
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<blockquote data-quote="nksmfamjp" data-source="post: 2218201" data-attributes="member: 1951"><p>I get that I'm overly focused on just this one point. A magnum is headspaced belt to bolt face, so the firing pin/ejector doesn't push it forward until the shoulder touches, usually. In a normal headspace gun, the belt should touch first with new ammo. </p><p></p><p>Upon firing, the case expands forward mostly to meet the chamber and of course and head clearance allows minimal rearward expansion.</p><p></p><p>Without annealing, I would expect neck and shoulder cracking as a failure from all the work hardening.</p><p></p><p>Since your cases fail by head separation, I'm thinking your headspace is NG. Have you gage'd it? I say that because the case would get pushed forward, fire, expand, then the head area(due to excessive head clearance) is expanding back to the bolt face excessively, over working the head.</p><p></p><p>Anybody else see case head failures on magnums as common?</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2218201, member: 1951"] I get that I’m overly focused on just this one point. A magnum is headspaced belt to bolt face, so the firing pin/ejector doesn’t push it forward until the shoulder touches, usually. In a normal headspace gun, the belt should touch first with new ammo. Upon firing, the case expands forward mostly to meet the chamber and of course and head clearance allows minimal rearward expansion. Without annealing, I would expect neck and shoulder cracking as a failure from all the work hardening. Since your cases fail by head separation, I’m thinking your headspace is NG. Have you gage’d it? I say that because the case would get pushed forward, fire, expand, then the head area(due to excessive head clearance) is expanding back to the bolt face excessively, over working the head. Anybody else see case head failures on magnums as common? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck Sizing Vs. Full Length Sizing and Neck Tension
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