i looked at a mytbusters episode if you shoot straight up any bullet will come back non lethal because it tumbles and can not reach the speed to kill.
but a bullet fired a angle keeps it's spin and since it is spinning it has less resistance then a tumbling bullet and is deadly.
it does not matter what bullet if it weight is high enough it is deadly weather it goes 1/2 a mile or 5 miles there are 22s and .223 bullets that has the same weight just the .223 goes farther.
and since they go up in the air terminal velocity matters
because when it is coming back down it's speed is from gravity which is
terminal velocity if a bullet goes 3000fpsitdoes not matterbecause when it starts to fall it will only reach it's terminal velocity

look at it like this if your are going 50 mph north and stop and pt your car in reverse and can only go 20 mph in reverse then you will not be going 50 mph any more
if a bullet travels 3000 fps out of a gun and can only ravel 1000 feet per second from terminal velocity it does not matter if it goes .Miles or 5 miles it will only be going 1000fps

and the debate was not how far a bullet goes but how much deadly it is falling down to the earth