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Rifles, Reloading, Optics, Equipment
Reloading
What's the ideal trimmed length of a cartridge, relative to the actual chamber length?
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<blockquote data-quote="Mikecr" data-source="post: 1638402" data-attributes="member: 1521"><p>I don't trim until cases get within 5thou(my preferred) of chamber end. I don't like it while clearance is beyond 10thou. This, because it contributes to back flow of gasses, delaying neck sealing (as seen by neck sooting) and building of carbon rings.</p><p>Both of these can affect ES in hunting capacity cartridges -more so than normal variance in neck lengths. So where you find that your case mouths are already >10thou do not trim them yet, unless you just know for sure they're never gonna get anywhere near close.</p><p>Fire forming will likely pull necks back further, while FL sizing will likely cause cases to lengthen, eventually, possibly, reaching goal end clearance for you to set.</p><p></p><p>With tight neck clearance and tight end clearance there is no carbon ring formation, and no carbon sooting on necks. This is achieved with a planned setting of chamber parameters for it.</p><p>For my tight chambers and relatively modern/improved cartridges, I size so little that cases don't grow and no trimming is needed beyond my plan (once, after 3rd fire forming).</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1638402, member: 1521"] I don't trim until cases get within 5thou(my preferred) of chamber end. I don't like it while clearance is beyond 10thou. This, because it contributes to back flow of gasses, delaying neck sealing (as seen by neck sooting) and building of carbon rings. Both of these can affect ES in hunting capacity cartridges -more so than normal variance in neck lengths. So where you find that your case mouths are already >10thou do not trim them yet, unless you just know for sure they're never gonna get anywhere near close. Fire forming will likely pull necks back further, while FL sizing will likely cause cases to lengthen, eventually, possibly, reaching goal end clearance for you to set. With tight neck clearance and tight end clearance there is no carbon ring formation, and no carbon sooting on necks. This is achieved with a planned setting of chamber parameters for it. For my tight chambers and relatively modern/improved cartridges, I size so little that cases don't grow and no trimming is needed beyond my plan (once, after 3rd fire forming). [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
What's the ideal trimmed length of a cartridge, relative to the actual chamber length?
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