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Rifles, Reloading, Optics, Equipment
Reloading
Brass questions
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<blockquote data-quote="MagnumManiac" data-source="post: 1456509" data-attributes="member: 10755"><p>I have had some of my smallest groups EVER with properly prepped NEW brass which wasn't repeatable after sizing them once fireformed.</p><p>Now, I DO NOT know why this occurrs, I have theories, but no hard and fast evidence as I could not repeat the curves I got over the pressure trace with once fired brass. Once fired brass with the same loads had harsher start pressures with completely different curves to the new brass.</p><p>Also, velocities were UP in the once fired brass.</p><p></p><p>The curves returned with the SAME LOT of NEW brass, as did the oblong holes it produced over a 10 shot string. (Oblong is the shape of the group, not the shape of the bullet holes).</p><p>Other new brass did NOT repeat this feat, however. It has occured several times now.</p><p></p><p></p><p>The curves appear to be softer, for want of a better word, and the rise under MAP is gentler, although MAP between the new brass and once fired doesn't vary much, the curves certainly do if you overlay them.</p><p></p><p>With all this said, I still think for consistency, once fired brass negates the results seen above, as reloading dies rarely bring cases back to factory specs and you would want to develop loads in stable brass, which in my view takes around 3 firings in most cartridges.</p><p></p><p>Cheers.</p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1456509, member: 10755"] I have had some of my smallest groups EVER with properly prepped NEW brass which wasn’t repeatable after sizing them once fireformed. Now, I DO NOT know why this occurrs, I have theories, but no hard and fast evidence as I could not repeat the curves I got over the pressure trace with once fired brass. Once fired brass with the same loads had harsher start pressures with completely different curves to the new brass. Also, velocities were UP in the once fired brass. The curves returned with the SAME LOT of NEW brass, as did the oblong holes it produced over a 10 shot string. (Oblong is the shape of the group, not the shape of the bullet holes). Other new brass did NOT repeat this feat, however. It has occured several times now. The curves appear to be softer, for want of a better word, and the rise under MAP is gentler, although MAP between the new brass and once fired doesn’t vary much, the curves certainly do if you overlay them. With all this said, I still think for consistency, once fired brass negates the results seen above, as reloading dies rarely bring cases back to factory specs and you would want to develop loads in stable brass, which in my view takes around 3 firings in most cartridges. Cheers. :) [/QUOTE]
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