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Rifles, Reloading, Optics, Equipment
Reloading
6.5 PRC Case Trim Length
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<blockquote data-quote="QuietTexan" data-source="post: 2496304" data-attributes="member: 116181"><p>In general, nothing. You could probably go so short as to create problems, but you shouldn't ever need to cut that much brass off to make a case work. Flip your focus around from "how short do I make them" to "how long can I leave them".</p><p></p><p>Case length is pretty far down the list of things that matters on target, with the caveat of assuming you're starting with matched, high quality brass. The goal is to make sure you don't hit the end of the chamber. Other than that, uniformity and consistency are the only reasons to do it. IMO trimming is done way too often, and results from oversizing cases. In my experience very few cases really grow so much and so inconsistently that they need to be trimmed every firing. Cases I'm intentionally sizing small like range AR brass yes because I'm intentionally making the case small, but for good rifle brass let it grow and let it fill out before you start cutting on it.</p><p></p><p>[URL unfurl="true"]https://www.brownells.com/reloading/measuring-tools/case-gauges-headspace-tools/sinclair-chamber-length-gage-prod32925.aspx[/URL]</p><p>I would recommend you actually measure your chamber length and don't trim to an arbitrary length from a book. Use what your chamber needs, it could very well be long or short and you'd never know.</p><p></p><p>I use a borescope to confirm cases are short of the end of the chamber. I don't trim to any set length, I trim back to uniformity after cases are fully grown if the variance warrants it. Last batch of Lapua brass was all within 0.003" of each other having never been trimmed, and still short enough for my chamber. This is about when I'd go through and uniform lengths and square up the necks just because, but everything seems to be working fine for now so I probably won't bother.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2496304, member: 116181"] In general, nothing. You could probably go so short as to create problems, but you shouldn't ever need to cut that much brass off to make a case work. Flip your focus around from "how short do I make them" to "how long can I leave them". Case length is pretty far down the list of things that matters on target, with the caveat of assuming you're starting with matched, high quality brass. The goal is to make sure you don't hit the end of the chamber. Other than that, uniformity and consistency are the only reasons to do it. IMO trimming is done way too often, and results from oversizing cases. In my experience very few cases really grow so much and so inconsistently that they need to be trimmed every firing. Cases I'm intentionally sizing small like range AR brass yes because I'm intentionally making the case small, but for good rifle brass let it grow and let it fill out before you start cutting on it. [URL unfurl="true"]https://www.brownells.com/reloading/measuring-tools/case-gauges-headspace-tools/sinclair-chamber-length-gage-prod32925.aspx[/URL] I would recommend you actually measure your chamber length and don't trim to an arbitrary length from a book. Use what your chamber needs, it could very well be long or short and you'd never know. I use a borescope to confirm cases are short of the end of the chamber. I don't trim to any set length, I trim back to uniformity after cases are fully grown if the variance warrants it. Last batch of Lapua brass was all within 0.003" of each other having never been trimmed, and still short enough for my chamber. This is about when I'd go through and uniform lengths and square up the necks just because, but everything seems to be working fine for now so I probably won't bother. [/QUOTE]
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Reloading
6.5 PRC Case Trim Length
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