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Rifles, Reloading, Optics, Equipment
Reloading
Primer pocket/flash hole prep.
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<blockquote data-quote="SidecarFlip" data-source="post: 1141697" data-attributes="member: 39764"><p>Thats because that first firing causes the brass to flow and assume that particular chambers dimensions. That is physics.</p><p></p><p>If you are loading previously fired brass that was fired in another chamber (not yours), expect case length to increase. One reason I keep my brass segregated, each rifle gets reloaded with the same brass and why I never use an expander ball on a die stem. Expander balls are fine for first size, after that, not needed.</p><p></p><p>The pill, exiting the case expands the neck and while it relaxes( the cartridge and case expand and contract or you would not be able to extract it), the neck is expanded enough that when you resize, you will contract it enough to secure the bullet... and that holds true with bushing and non-bushing dies.</p><p></p><p>Why work it twice and working the neck causes it to grow' as well, and workharden, shortening the brass life.</p><p></p><p>On new brass, I never trim, no need. OFB, always.</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 1141697, member: 39764"] Thats because that first firing causes the brass to flow and assume that particular chambers dimensions. That is physics. If you are loading previously fired brass that was fired in another chamber (not yours), expect case length to increase. One reason I keep my brass segregated, each rifle gets reloaded with the same brass and why I never use an expander ball on a die stem. Expander balls are fine for first size, after that, not needed. The pill, exiting the case expands the neck and while it relaxes( the cartridge and case expand and contract or you would not be able to extract it), the neck is expanded enough that when you resize, you will contract it enough to secure the bullet... and that holds true with bushing and non-bushing dies. Why work it twice and working the neck causes it to grow' as well, and workharden, shortening the brass life. On new brass, I never trim, no need. OFB, always. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Primer pocket/flash hole prep.
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