Looking at a post made last month concerning the title, I’ve gone to my can of shooter stuff and low and behold, I have several US boxes of .30 cal. M2 Ball. From my reading, I also thought that the Alternate M2 Ball was supposed to be GMCS, but when testing with the magnet, the box with BALL, CALIBER .30 M 2 ALT., AMMUNITION LOT D.M. 20166 (D M 42) DOES NOT attract. Wait, it gets even better. The boxes marked BALL, CALIBER .30 M 2, Ammunition Lot E.W. 28189 (E W 43) AND BALL, CALIBER .30 M2, LOT W.R.A. 23140 (WRA 45) DO ATTRACT!! Not a mark of ALTERNATE, ALTERNATIVE or ALT. on them. There goes several years of belief out the window.
I would love to post pix, but every time I have tried to on other forums, I make an awful hash of it. For anyone going to the Denver, PA show, I’ll bring them up.