All right, here I go again! Im reading about bullets compressing into the casing and putting marker on your rounds. Imm assuming (yes, thats ass-u-meing) that this is from taking out your carry rounds and replacing them with FMJ for plinking/ target shooting. Am I right. Why not just get a few extra mags and leave your carry ammo home? Be nice. Remember, Im a rookie at this. Down boy! Niiiiicccceeee!!!