No, I meant how does one indicate someone used up 50 shots? I think the situation Mike was dealing with, the cost per round was like 8gp (I think the guy was double firing or something). Apparently the GM was not tracking it and neither was the player. Mike said something about once he made them track the gold, the player suddenly decided he wasn't going to fire his gun with an -8 penalty.
But after the player leaves the table, I'm wondering what stops him from just ignoring the spent ammo? If the Chron doesn't list it as gold spent....?