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<blockquote data-quote="QuietTexan" data-source="post: 2621894" data-attributes="member: 116181">First, only use matched brass from the same lot. Don&#039;t worry about new out of the box measurements other than not being overtly and plainly out of spec.&nbsp; Usually I drop cases in an LE Wilson case gauge out of the box and if they fit they get fired.&nbsp; About the only cases that I cull when new are ones that don&#039;t drop in at first, and then don&#039;t drop in after a trip through a sizing die. Second, fire them at least twice before you move the shoulders or trim them.&nbsp; If you inspect new brass and the shoulder measurement varies by .002-.003 then you would expect the overall case lengths to change as the shoulders blow out when fired.&nbsp; So by trimming before the case is fully formed you&#039;re actually introducing a variance you&#039;ll have to cut out again later.Third, measure your actual chamber (as mentioned before), trim them to work with that if they ever need it.&nbsp; If they don&#039;t, then I&nbsp; don&#039;t.&nbsp; Big&nbsp; caveat - I shoot a lot of improved chambers/35-40* shoulders that stay short on their own, 30-06 is about all that I really need to trim for fitment issues because the shallow shoulders do grow a lot no matter what.&nbsp; If you&#039;re shooting shallow shoulder angles then you&#039;ll need to trim more frequently.&nbsp; One important thing:&nbsp; when/if cases need to be trimmed, check how square the necks are.&nbsp; Especially if you previously trimmed to a square end and then have to trim again.&nbsp; Uneven neck growth can be an indicator of thickness variation, and cases that grow unevenly can have more issues than just in the necks like capacity variances.I wouldn&#039;t bother sorting by case length, there are several other data points that are significantly more important and much harder to change.</blockquote>

[QUOTE="QuietTexan, post: 2621894, member: 116181"] First, only use matched brass from the same lot. Don't worry about new out of the box measurements other than not being overtly and plainly out of spec. Usually I drop cases in an LE Wilson case gauge out of the box and if they fit they get fired. About the only cases that I cull when new are ones that don't drop in at first, and then don't drop in after a trip through a sizing die. Second, fire them at least twice before you move the shoulders or trim them. If you inspect new brass and the shoulder measurement varies by .002-.003 then you would expect the overall case lengths to change as the shoulders blow out when fired. So by trimming before the case is fully formed you're actually introducing a variance you'll have to cut out again later. Third, measure your actual chamber (as mentioned before), trim them to work with that if they ever need it. If they don't, then I don't. Big caveat - I shoot a lot of improved chambers/35-40* shoulders that stay short on their own, 30-06 is about all that I really need to trim for fitment issues because the shallow shoulders do grow a lot no matter what. If you're shooting shallow shoulder angles then you'll need to trim more frequently. One important thing: when/if cases need to be trimmed, check how square the necks are. Especially if you previously trimmed to a square end and then have to trim again. Uneven neck growth can be an indicator of thickness variation, and cases that grow unevenly can have more issues than just in the necks like capacity variances. I wouldn't bother sorting by case length, there are several other data points that are significantly more important and much harder to change. [/QUOTE]

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