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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Increase in velocity with stored ammo question?
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<blockquote data-quote="Mikecr" data-source="post: 1996638" data-attributes="member: 1521"><p>15thou under loaded is extreme. I'm sure you meant .0015" interference.</p><p>1.5thou interference is plenty & good.</p><p></p><p>Things in play here:</p><p>#1 FL sizing of necks is nothing but bad. You should stop doing that. Especially when sizing length exceeds seated bullet bearing.</p><p>#2 Even with annealed, grain structure is broken with sizing down & again with sizing up. I don't think I could prove it now, but I suspect that early hardening is more dramatic than later, and that this condition is actually LESS stable to manage.</p><p>#3 Sizing adds energy that puts brass at a new balance. Then a new lowest energy state(counter to last action) is not recovered immediately.</p><p></p><p>I believe you're right. That your neck tension is likely rising with time.</p><p>In fact, every part of your reloaded cases react over time to counter last energies added. Body, shoulders, necks, and primers/pockets.</p><p>You can account for this with a little bit of testing (over time) and reloading adjustments. An extra 1/2thou bump, extra 2thou primer crush, couple less kernels of powder, etc. Date the box.</p><p></p><p>If I load ammo today, for shooting today, it's stable.</p><p>If I'm delayed a week with shooting, it will not shoot the same. </p><p>It will be stable but different again several months from now.</p><p>So to hold stable hunting ammo where I cannot load for each day of shooting, I purposely load it several months in advance. With this, I've got ammo ready for groundhog hunting -before it peaks out for a shadow.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1996638, member: 1521"] 15thou under loaded is extreme. I'm sure you meant .0015" interference. 1.5thou interference is plenty & good. Things in play here: #1 FL sizing of necks is nothing but bad. You should stop doing that. Especially when sizing length exceeds seated bullet bearing. #2 Even with annealed, grain structure is broken with sizing down & again with sizing up. I don't think I could prove it now, but I suspect that early hardening is more dramatic than later, and that this condition is actually LESS stable to manage. #3 Sizing adds energy that puts brass at a new balance. Then a new lowest energy state(counter to last action) is not recovered immediately. I believe you're right. That your neck tension is likely rising with time. In fact, every part of your reloaded cases react over time to counter last energies added. Body, shoulders, necks, and primers/pockets. You can account for this with a little bit of testing (over time) and reloading adjustments. An extra 1/2thou bump, extra 2thou primer crush, couple less kernels of powder, etc. Date the box. If I load ammo today, for shooting today, it's stable. If I'm delayed a week with shooting, it will not shoot the same. It will be stable but different again several months from now. So to hold stable hunting ammo where I cannot load for each day of shooting, I purposely load it several months in advance. With this, I've got ammo ready for groundhog hunting -before it peaks out for a shadow. [/QUOTE]
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Increase in velocity with stored ammo question?
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