The reason some members of the group thought the gun would explode is because of the pressure the water would apply to the bulllet exiting from case or the barrel, not because of the gun powder. I guess exploding is not the correct term, but crack the metal is most appropriate.
I have a couple of questions for the members of this great site. If I shoot a .45acp bullet with 230 grains in a 5" barrell in salt water at a depth of 140', will the gun explode? does the type of bullet makes any difference? for example flat head vs cone shaped? What would be the formula to...