I have been shooting Stone Hart .45 230 FMJ and started having problems with it. My gun began to jam about 1/4 inch from full battery. I tried changing mags, but still jammed. I switched to Armscor .45 and the jamming is history. It is very accurate ammo. I get about a 1 1/2 inch group at 25 yards using bench rest. This is good stuff!! Anybody else out there use Armscor ammo?? I shoot RI .45 match version, and Colt .45 Gold Cup.