Or you could outside neck turn the brass. Make them all the same thickness. Pain in the butt, but it's a one time thing to do. Just depends on how much you want to get into it. Or, Redding and Hornady both make neck sizing dies with bushings. Mike the outside of a loaded round, or make up a dummy round with the bullet in it,(preferable the one with the thinnest brass), and subtract .003 for the bushing. gypsyman