I have about 50 pcs of 7mm rem brass, that I have had for a long time, I got it with a bunch of other stuff, I don't know what to make of it, it is all in good shape but it is anywhere from 20 thou to 100 unde,r Rem 7 mag is 2.5" and they are 2.480 to 2.410, how short can a pcs of brass be under sized and still be able to use it, and be OK.

Tanks Dean