One of my club mates is giving up shooting and is selling a ROA, and I'm waiting until my FAC renewal comes up at the end of june to put it on my ticket, the question is that he has it on his ticket as a .44, but the ones that I have seen are all advertised as .45, he uses a .457 ball in it when loading at the club, so what is the correct calibre to put on my appplication.