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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Saum won’t chamber after shooting session
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<blockquote data-quote="highdrum" data-source="post: 2889068" data-attributes="member: 13732"><p>Sizing brass that has all been fired ar same pressure will result in very close uniform dimension of shoulder bump. If you take 20 cases that we're all fired with 0.3gr increase in charge per case, the amount of sizing that will occur will get less as the powder charge went up. More psi in the case creates larger dimensions that need sized a bit more, it also hardens the brass a lil more with increased work hardening. </p><p></p><p>Once you shoot a ladder, always put you're cases back into ammo box in order they are shot. Decap primers and check shoulder datum, you'll see the growth as the psi goes up, not only at shoulder but also at web area. As the die sizes the web more, that brass has to move somewhere, it usually goes to shoulder area, further preventing adequate bump.</p><p></p><p>Just some things I've found in my load development processes. You can't just set your die in one place and expect it to size every case the same if they've been loaded to different pressures. Just an inconsistency of lube application can change shoulder bump by 0.001 in brass fired at same charge weight.</p></blockquote><p></p>
[QUOTE="highdrum, post: 2889068, member: 13732"] Sizing brass that has all been fired ar same pressure will result in very close uniform dimension of shoulder bump. If you take 20 cases that we're all fired with 0.3gr increase in charge per case, the amount of sizing that will occur will get less as the powder charge went up. More psi in the case creates larger dimensions that need sized a bit more, it also hardens the brass a lil more with increased work hardening. Once you shoot a ladder, always put you're cases back into ammo box in order they are shot. Decap primers and check shoulder datum, you'll see the growth as the psi goes up, not only at shoulder but also at web area. As the die sizes the web more, that brass has to move somewhere, it usually goes to shoulder area, further preventing adequate bump. Just some things I've found in my load development processes. You can't just set your die in one place and expect it to size every case the same if they've been loaded to different pressures. Just an inconsistency of lube application can change shoulder bump by 0.001 in brass fired at same charge weight. [/QUOTE]
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Saum won’t chamber after shooting session
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