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Rifles, Reloading, Optics, Equipment
Reloading
Pulling bullets / Reseating / Neck Tension
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<blockquote data-quote="Mikecr" data-source="post: 811739" data-attributes="member: 1521"><p>Hardened brass springs back more.</p><p>You're not hardening brass with fired expansion, you're taking it to yield.</p><p>When brass is expanded let's say 3thou(1thou beyond springback), it yields 1thou and springs backs slightly less than expected 2thou -because it is now thinner. This action happens with each firing provided you're running high enough pressures, or with low shoulder angles/high body taper/big clearances, to cause yielding(although less & less of it). Unmanaged, it leads to extraction problems.</p><p></p><p>The answer to extraction problems is NOT loose chambers, or big sizing. It's managing load pressure for the amount of barrel steel around a given chamber area to control brass yielding. This, followed by sizing that maintains target springback, produces stable brass that works well, lasts forever, and without FL sizing(just shoulder bumps & partial neck sizing).</p><p></p><p>With a case designed with high shoulder angles, low body taper, fired in low chamber clearances at moderate pressures, it's possible to eliminate sizing in reloading all together. The brass will not yield and just spring right back to set dimensions.</p><p>I nearly managed this with my 6.5WSSM, but 35deg shoulder angles are still too shallow. Next chamber will provide 45deg shoulders. Necks are fitted, and I don't have to size them.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 811739, member: 1521"] Hardened brass springs back more. You're not hardening brass with fired expansion, you're taking it to yield. When brass is expanded let's say 3thou(1thou beyond springback), it yields 1thou and springs backs slightly less than expected 2thou -because it is now thinner. This action happens with each firing provided you're running high enough pressures, or with low shoulder angles/high body taper/big clearances, to cause yielding(although less & less of it). Unmanaged, it leads to extraction problems. The answer to extraction problems is NOT loose chambers, or big sizing. It's managing load pressure for the amount of barrel steel around a given chamber area to control brass yielding. This, followed by sizing that maintains target springback, produces stable brass that works well, lasts forever, and without FL sizing(just shoulder bumps & partial neck sizing). With a case designed with high shoulder angles, low body taper, fired in low chamber clearances at moderate pressures, it's possible to eliminate sizing in reloading all together. The brass will not yield and just spring right back to set dimensions. I nearly managed this with my 6.5WSSM, but 35deg shoulder angles are still too shallow. Next chamber will provide 45deg shoulders. Necks are fitted, and I don't have to size them. [/QUOTE]
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Pulling bullets / Reseating / Neck Tension
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