This is about effectively dealing with human threats, not "human sized targets". The size of the vital areas selected for destruction are much smaller.
To reliably instantly shut down a human threat, your target area in the head is a roughly 3" circle in the center of the head. Sometimes parts of the head can be obscured by hard cover or things I don't want to put bullets into.
Common loop-holes in walls (murder holes) can be as small as 3" and still permit the bad-guy to aim through them while shooting. Putting bullets through them and not around them end the fight a lot faster.
The precision requirement of a "W" in a gunfight is greater than most people understand.
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