[BwanaNdege]

That way, it would make the enemy forces have to use personnel to extract the wounded from the field -meaning less people available for the fight.

That did not always work.

Sometimes the NVA/VC would bury their wounded.

[RandallFlagg]

Well, I didn’t say that it would work. That was just the concept behind the 5.56 cartridge.
But as to the original question of the thread, three to the chest would likely be fatal.