I don't know. Maybe for a .50 caliber
DarkBls I'm ashamed of you. You should know better.
A .50 calibre BMG round will travel right through a helmet with relative easy, blowing the poor target's head out the back of his skull.
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What I want to emphasize to vereyone here (and what I say over and over), is that you have to remember that in INF "DEAD" isn't always dead.
In the game, what most of us consider to be "dead" is in fact "out of combat capability". That means that you are in a state that you are no longer able to contribute to battle. That COULD be death, but could also mean hydrostatic shock, severe pain, unconscious, immobile, etc.
The number of shots required in any part of your body to be considered "dead" for game purposes is the same (with the exception of the head). If we think of it in the way that the beretta M9 takes 3 shots to make a "kill", then even 3 shots in the foot would almost definately also put a real soldier out of immediate combat action, as would any 3 such shots to any part of the body.
Think in realistic terms, and remember that INF avoids randomness for gameplay reasons (we all know that some have continu3ed on with such injuries, but these occurences are BY FAR the minority), and issues like this answer themself.
The current INF soldier is actually MUCH ,ore capable than a real soldier would be, as he only has two states "In Action" and "Out of Action". He can take a shot in the chest, foot etc. with no discernable effect. It isn't until he takes enough damage to "put him out of action" does he lose any ability, it just happens that he loses ALL ability at that point.