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Rifles, Reloading, Optics, Equipment
Reloading
300 win mag brass
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<blockquote data-quote="MagnumManiac" data-source="post: 1243516" data-attributes="member: 10755"><p>The cause is most often from NOT sizing the brass enough. This can be caused by hard brass as well. Brass of different manufacture can vary considerably in hardness, some take more deflection to achieve the same amount of set back.</p><p>The simple mechanics of FL sizing cause the brass to grow longer from head to shoulder as the body is squeezed smaller, if the die is not adjusted to push the shoulder back after this growth, it will NOT be even close to FL sized and will fail to chamber.</p><p>If brass is hard chambering after FL sizing, then you need to screw the die IN more, if this means the press cams over, then so be it.</p><p>There is so much stuff on the web about camming over damaging your press and brass that people believe it. It is simply untrue that camming over damages anything on your press, it simply only takes out the slack in the linkages, just don't bind up the press.</p><p>The simple fact is, if there is a case in the press, the ram is at the top and there IS a GAP between the DIE BOTTOM and SHELL HOLDER TOP, there is room to size that case more.</p><p>I use 1/12 turns when setting up dies, once I get them set, I mark datum on lock ring and die, remove the die from the press and tighten the retaining screw. I also swap out those brass grub screws with hardened steel ones and place a lead shot under it, then tighten it so that the lock ring will never move, even when yanking on a wrench to tighten it onto the press.</p><p></p><p>Hope this helps you understand WHY some cases fail to chamber after sizing them.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1243516, member: 10755"] The cause is most often from NOT sizing the brass enough. This can be caused by hard brass as well. Brass of different manufacture can vary considerably in hardness, some take more deflection to achieve the same amount of set back. The simple mechanics of FL sizing cause the brass to grow longer from head to shoulder as the body is squeezed smaller, if the die is not adjusted to push the shoulder back after this growth, it will NOT be even close to FL sized and will fail to chamber. If brass is hard chambering after FL sizing, then you need to screw the die IN more, if this means the press cams over, then so be it. There is so much stuff on the web about camming over damaging your press and brass that people believe it. It is simply untrue that camming over damages anything on your press, it simply only takes out the slack in the linkages, just don't bind up the press. The simple fact is, if there is a case in the press, the ram is at the top and there IS a GAP between the DIE BOTTOM and SHELL HOLDER TOP, there is room to size that case more. I use 1/12 turns when setting up dies, once I get them set, I mark datum on lock ring and die, remove the die from the press and tighten the retaining screw. I also swap out those brass grub screws with hardened steel ones and place a lead shot under it, then tighten it so that the lock ring will never move, even when yanking on a wrench to tighten it onto the press. Hope this helps you understand WHY some cases fail to chamber after sizing them. Cheers. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 win mag brass
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