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Rifles, Reloading, Optics, Equipment
Reloading
Chamber length and trimming
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<blockquote data-quote="Mikecr" data-source="post: 1900816" data-attributes="member: 1521"><p>Now that you know your chamber length, the manual information is useless, right?</p><p>It was always useless, right?</p><p>Desired trim length for me is at or within 10thou of chamber end. I wouldn't retrim until cases went well under 5thou of chamber end. But that never happens to me(I don't FL size). My cases shrink in OAL at first, and then grow very little, very slowly, until settled.</p><p></p><p>Excess chamber end clearance, like excess neck clearance, allows carbon to gain momentum rearward. This, affecting consistency of neck sealing and building of a carbon donut that acts to reduce clearance. It's hard to manage an ES of <10fps without controlling these clearances.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1900816, member: 1521"] Now that you know your chamber length, the manual information is useless, right? It was always useless, right? Desired trim length for me is at or within 10thou of chamber end. I wouldn't retrim until cases went well under 5thou of chamber end. But that never happens to me(I don't FL size). My cases shrink in OAL at first, and then grow very little, very slowly, until settled. Excess chamber end clearance, like excess neck clearance, allows carbon to gain momentum rearward. This, affecting consistency of neck sealing and building of a carbon donut that acts to reduce clearance. It's hard to manage an ES of <10fps without controlling these clearances. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Chamber length and trimming
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