In the 1986 Miami FBI Shootout, the main bad guy (Platt) was shot by one of the agents (Dove), whom he later killed. Dove's shot penetrated to within an inch of Platt's heart. IIRC, the FBI was using HP rounds. Maybe if it had been a hardball or a .45 instead of a 9MM, that extra inch would have been covered and the shootout would have ended with two bad guys dead. Not two FBI agents and two bad guys dead. This is why the FBI tried to go to 10MM.
Platt and Mattox were both shot to hell and back and still managed to carry on until Ed Mireles took them both out at nearly contact range with his .357. That he was able to end the fight with his left arm blown nearly off was a testimony to true grit.