When some one pulls the trigger on a firearm all hell breaks loose. What follows is a contained explosion calculated to kill. The gun has no brain. It cannot stop in the middle of its work. In a flash, one action instantly leads to another, a chain reaction.
Read the case of "John Doe Snort", a case of mistaken identity of sorts. There was no single hole. The shots, however many, had overlapped one another, resulting in one gaping hole. Enough bare skin around the perimeter was visible through the rips in the shirt to see the characteristic scalloping in the flesh around the wounds."