[And so that’s your theory. My theory has me owning a Government model .45 cal. It works on bears. The 9mm is like a bee sting to them.]
Not my theory. His. A cop who had over a dozen .45 rounds hit a moving target who was firing back at him, including 5 fatal wounds, ended the fight only after 3 head shots, only the last of which hit the brain pan. His conclusion was that people overestimate their hit rate under combat stress against moving targets and underestimate the amount of time an adversary can keep firing at you even after receiving numerous fatal wounds. His conclusion was you need to keep shooting until the other guy stops moving, and that can take dozens of rounds. Massad Ayoob, the guy who wrote the bible on combat handgun use, examined the case and concluded that this cop did everything right and was exceptionally skilled, yet almost came up short.