I've been gathering a wealth of info off of this site for over a year now and have come across a question that i've been unable to find the answer to. Can somebody explain why the trim lenth for a 280 AI is 2.525 yet it is apparently safe to fireform 280 Rem with a trim length of 2.540? Do i trim after fireforming or is it o.k to trim before??? Or, why trim to AI specs at all if .015 more doesn't really matter in this case? I'm loading new Rem brass. Thanks for any help you can give and also for all of the great info so far. Great site!