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Rifles, Reloading, Optics, Equipment
Reloading
Pretty sure it's a newb question..
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<blockquote data-quote="Mikecr" data-source="post: 669346" data-attributes="member: 1521"><p>I trim/form to within 5thou of chamber end if I can. </p><p>My minimum desired length is 10thou from chamber end, again, if I can.</p><p>Beyond this I just take em all to the same length.</p><p></p><p>It's not always simple there. </p><p>I want case mouths as close to chamber end as possible to reduce ES(sooting side effect). But fireforming usually reduces length a few thou as the necks are pulled backward by forming shoulders.</p><p>So when I can trim new brass to just kissing chamber end, it fireforms backward to MY max length, and I never mess with it again. I never have to.</p><p></p><p>Those who COW fireform can trim to slightly crimp on chambering, and their mouths snap back into tight clearances. This is appropriate with formed wildcats that will never see further body sizing, and so they will never need further trimming.</p><p>Also, if you run a very fast powder cartridge, trim length can be shorter without penalty, because necks will seal fast enough anyway. This is not hunting cartridges/bullets though, but more like BR cartridges/bullets.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 669346, member: 1521"] I trim/form to within 5thou of chamber end if I can. My minimum desired length is 10thou from chamber end, again, if I can. Beyond this I just take em all to the same length. It's not always simple there. I want case mouths as close to chamber end as possible to reduce ES(sooting side effect). But fireforming usually reduces length a few thou as the necks are pulled backward by forming shoulders. So when I can trim new brass to just kissing chamber end, it fireforms backward to MY max length, and I never mess with it again. I never have to. Those who COW fireform can trim to slightly crimp on chambering, and their mouths snap back into tight clearances. This is appropriate with formed wildcats that will never see further body sizing, and so they will never need further trimming. Also, if you run a very fast powder cartridge, trim length can be shorter without penalty, because necks will seal fast enough anyway. This is not hunting cartridges/bullets though, but more like BR cartridges/bullets. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Pretty sure it's a newb question..
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