ran into a guy at the bowling pin match and again at the 10 yd pistol bench yesterday. he shots a S&W 45 auto rim revolver with a guestimated 6" bbl. an incredible gun and shooter. witnessed a 10 shot 1 hole group smack dead center at 10 yd's, def less than 1". never saw an auto rim before. same as a 45acp with a larger rim on it? also no idea of their mfg date.