Exactly how many bullets does it take to kill someone?
There is no such thing as "exactly" how many. Too many variables are involved. Here is a partial quote about one perp who was shot and killed with "center mass shots"...
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One, two or even several well placed “center mass” shots may not do what you think it will, and learning to recognize this before you gunfight may save ... ammunition (the subject was hit 106 times, but 55 of those hits were ruled by the coroner to be each lethal in and of themselves) before he went down.
I saw a dash cam video of a LEO who got in a scuffle with a perp who shot him once with a .22 pistol, and the LEO pulled his pistol, and shot the perp 3 or 4 times, center mass. The perp went down, and the cop called for backup, then staggered, sat down, and died. He had been shot through the heart with a .22, and the perp, shot multiple times with either a 9mm or .40, survived.
I read a story about a perp on PCP who was standing in the middle of an intersection who was shot over 30 times with 9mm's and took multiple hits with 00 buckshot from 12 ga pumpguns. He had been shot in the face and blinded, but was still standing in the middle of the street, trying to reload his pistol by "feel" when a cop came up behind him and butt-stroked him with his pump shotgun.... the perp fell down, and finally died.
so, exactly how many does it take? It takes as many as it takes.....