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Rifles, Reloading, Optics, Equipment
Reloading
First case head separation
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<blockquote data-quote="nksmfamjp" data-source="post: 2909714" data-attributes="member: 1951"><p>I did this with 300 Sherman once, no belt.</p><p></p><p>Action type seems to have some impact….I.e. axial flex Also, I hypothesize that the hardness gradient from base to shoulder area of new brass affects how it forms to the actual chamber quite a bit.</p><p></p><p>In my first round of 300 Sherman, I fireformed with an ~ 50000psi load. Slow, but firm. The 280ai brass seemed stronger in the shoulder than the case body. Even with a false neck, the cases stretched and after 4-5 firings showed a thin spot towards the base.</p><p></p><p>The next time I used 270 Starline brass and the COW method. I'm at around 3-4 firings now with no thinning. I think if I were using magnum brass, I would anneal shoulders to encourage that area to form when COW forming.</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2909714, member: 1951"] I did this with 300 Sherman once, no belt. Action type seems to have some impact….I.e. axial flex Also, I hypothesize that the hardness gradient from base to shoulder area of new brass affects how it forms to the actual chamber quite a bit. In my first round of 300 Sherman, I fireformed with an ~ 50000psi load. Slow, but firm. The 280ai brass seemed stronger in the shoulder than the case body. Even with a false neck, the cases stretched and after 4-5 firings showed a thin spot towards the base. The next time I used 270 Starline brass and the COW method. I’m at around 3-4 firings now with no thinning. I think if I were using magnum brass, I would anneal shoulders to encourage that area to form when COW forming. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
First case head separation
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