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I think mythbusters fudged their results some for liability reasons. There is no way a bullet FALLING has the velocity to kill.

Now, a bullet shot at an angle returning to earth on an arc, that's a different story. I also believe the difficulty in finding the shooter is the result of the significant distance the shooter would be from the point of impact.

Think of a hail stone falling from the sky. It takes a significantly large one to kill someone and that is not from penetration but blunt force trauma.