Ah gaht a qweschun!!!
so, if 10mm is the same bullet as a 40S&W, can you buy a Springfield XD40, get the right magazine, barrel, and whatnot, and shoot them both, or is it like the ol' 38spl/357mag thing?
I've also heard of being able to use a 40S&W gun with the right mag, and barrel, to shoot 357Sig rounds.
um, so how's that work? is the 357Sig case the same size as the 40? or... er.... huh?
I dunno.
FWIW, IIRC, AFAIK, FTMP, IANAL. YMMV.