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Rifles, Reloading, Optics, Equipment
Reloading
Berger bullets showing pressure
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<blockquote data-quote="Mike Matteson" data-source="post: 2480851" data-attributes="member: 101791"><p>Back the other way. If you don't get your base to the bolt face, you produce a lot of case stretch, because you are allowing the stretch at the base and not at the shoulder where is should be. Think about it. If your case isn't tight to the face of the bolt, and fitted in loosely. What going to happen. You are going to have case stretch at both ends, and the shoulder is where you want it, not at the base. Why do you think the match shooter are only bumping there shoulder back a .002 or so. Your metal in the brass growths forward, and not back. They are trying to reduce the stretch as much as possible. That why they are reloading with only a small set back at the shoulder. </p><p>Now I use to FL size my 308NM and would loose the case do to case stretch in about 3 firing at the base. Change to a neck sizing die that was a 300WM. The necks are shorter. I stumble on to this by accident. I didn't change the shoulder length at all. My case went 10-12 firing before loosing the primer pockets.</p></blockquote><p></p>
[QUOTE="Mike Matteson, post: 2480851, member: 101791"] Back the other way. If you don't get your base to the bolt face, you produce a lot of case stretch, because you are allowing the stretch at the base and not at the shoulder where is should be. Think about it. If your case isn't tight to the face of the bolt, and fitted in loosely. What going to happen. You are going to have case stretch at both ends, and the shoulder is where you want it, not at the base. Why do you think the match shooter are only bumping there shoulder back a .002 or so. Your metal in the brass growths forward, and not back. They are trying to reduce the stretch as much as possible. That why they are reloading with only a small set back at the shoulder. Now I use to FL size my 308NM and would loose the case do to case stretch in about 3 firing at the base. Change to a neck sizing die that was a 300WM. The necks are shorter. I stumble on to this by accident. I didn't change the shoulder length at all. My case went 10-12 firing before loosing the primer pockets. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Berger bullets showing pressure
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