Another problem with a "head shot" is that the persons brain must be hit to insure incapacitation not necessarily death but if the bullet lacerates certain areas it has a good chance of being fatal.If the bullet misses the brain or top of the spinal column it may only end up being a flesh wound that is painful but not fatal.
Most people do not survive high powered bullets to the head like say a 5.56x45mm or 7.62x51mm hit simply because the bullet has so much force behind it that it destroys the tissue in the general area of a hit which when you are talking the brain that is bad.
Lower powered rounds though like a .22 you can survive it all depends on range, where the round hits etc.Several people have survived .22 rounds to the head usually fired from a pistol.An aid to Robert Kennedy was hit in the head when Kennedy was shot by Surhan Surhan and he survived with full functionality.
The U.S. Representative that got shot in Arizona was hit in the brain by a 9mm bullet fired form a Glock 19 the bullet went through her head completely so it was probably a FMJ and not a JHP(hollow point) so also the type of round itself is a factor as well.
According to LOAC and the Hague Conventions armed forces are only allowed to use Full Metal Jacket rounds against enemy combatants hollow points,wad cutters and dumb dumbs are banned.So Bin Laden took FMJs when he went down.
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