Adam 330, Yes, the 6mm rem. LCD will size both 6mm rem & 6mm AI...... I have a 6mm AI & a .257AI......... Use rem parent brass for both & see no advantage in using .257 rbts brass for 6AI. Was warned NOT to use 7X57 brass for my .257AI by Dave Kiff. He shoots the .257 AI & got donuts w/ 7X57 Norma brass. Don't know if 7X57 brass would cause same problem w/ 6mm AI but why take the chance ???