What is the minimum trim length on brass?

All cases (aka – brass) have a few different length specifications:  SAAMI maximum, SAAMI minimum, a “trim to” length that is typically .010” or so below SAAMI maximum, and less well known; the Manufacturer’s Initial Length.  Because new cases are often slightly smaller in diameter than a fired and resized case, some allowance needs to be given for the initial case stretch that can occur when fired in the chamber.  Because of this allowance, the Manufacturer’s Initial Length will sometimes be slightly shorter than SAAMI minimum length.  Rest assured, this is absolutely fine and the cases will “grow” into specification as they are fired and resized the first few times.

Last update:
2014-10-08 17:46
John Bullet
Average rating: 4 (4 Votes)

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