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Rifles, Reloading, Optics, Equipment
Reloading
Trimming case length, how much does it really matter?
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<blockquote data-quote="Mikecr" data-source="post: 976396" data-attributes="member: 1521"><p>Well I don't do anything by a book. I measure the chamber end length with a gage and trim from there.</p><p>I set -5thou from end where I can.</p><p></p><p>For your expectations, being way short of chamber end probably won't matter. Being long will matter and it can be dangerous.</p><p>The price for being way short(like +10thou) is increased velocity spreads(ES). With more clearances, gas can better work it's way around necks/shoulder prior to case sealing. It's an angle thing.</p><p>This adds a variance to case sealing & so to your peak pressure curves.</p><p>It's not a lot, but one of the matters in reducing ES.</p><p></p><p>A 30-06 has to be sized & trimmed continually. You're left to manage this, so don't even bother to try staying long without getting in trouble. Just pick a value that's conservative to your management of it. Maybe 10-20thou.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 976396, member: 1521"] Well I don't do anything by a book. I measure the chamber end length with a gage and trim from there. I set -5thou from end where I can. For your expectations, being way short of chamber end probably won't matter. Being long will matter and it can be dangerous. The price for being way short(like +10thou) is increased velocity spreads(ES). With more clearances, gas can better work it's way around necks/shoulder prior to case sealing. It's an angle thing. This adds a variance to case sealing & so to your peak pressure curves. It's not a lot, but one of the matters in reducing ES. A 30-06 has to be sized & trimmed continually. You're left to manage this, so don't even bother to try staying long without getting in trouble. Just pick a value that's conservative to your management of it. Maybe 10-20thou. [/QUOTE]
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Reloading
Trimming case length, how much does it really matter?
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