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Rifles, Reloading, Optics, Equipment
Reloading
When to anneal brass.
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<blockquote data-quote="MagnumManiac" data-source="post: 1251585" data-attributes="member: 10755"><p>It's true that annealing reduces neck tension, this in turn changes start pressure, it is this that causes the better ES and SD numbers, not the actual seating force, as bullet release isn't by friction, it is by neck expansion. The neck expands readily early in the burn. I run no more than .0015" in my comp guns, and .001" is normal for my guns. I find the low seating pressure to enhance start pressure and the annealing every firing makes everything consistent.</p><p>I ran some tests over my pressure trace with bullets that could easily be moved by hand, careful chambering proved that the neck tension wasn't that important when the bullets were resting on the lands, start pressure was uniform, when the bullets were at different OAL the start pressure was errattic, this all proves that the actual neck tension isn't the deciding factor, it's the start pressure of the loads.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1251585, member: 10755"] It's true that annealing reduces neck tension, this in turn changes start pressure, it is this that causes the better ES and SD numbers, not the actual seating force, as bullet release isn't by friction, it is by neck expansion. The neck expands readily early in the burn. I run no more than .0015" in my comp guns, and .001" is normal for my guns. I find the low seating pressure to enhance start pressure and the annealing every firing makes everything consistent. I ran some tests over my pressure trace with bullets that could easily be moved by hand, careful chambering proved that the neck tension wasn't that important when the bullets were resting on the lands, start pressure was uniform, when the bullets were at different OAL the start pressure was errattic, this all proves that the actual neck tension isn't the deciding factor, it's the start pressure of the loads. Cheers. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
When to anneal brass.
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