ROFL, I hope you are not seriously considering wearing two holsters at one time. That is too weird for me. I know that any one draw would NOT be worth wearing 2 holsters for a match, but if you where to wear 2 holsters the entire match, the rulebook, as I read it, doesn't prohibit you from switching which one you place it. This in no way applies to the original question, as magazines are treated differently than guns, ie. you can drop a mag during a match, but not a gun.