[Brian Pfleuger]

I can envision circumstances where the threat on the other side of the door has been positively identified and shooting would be justifiable. In most cases I agree that waiting until the BG is visible is a better option. I would be shouting orders (and warnings) while they are on the other side of the door.


So far as the question of just plain shooting through a door, or anything else for that matter:

FMJ is going to be less damaged by passing through pretty much anything. In other words, all else being equal, FMJ will penetrate better and be less damaged, regardless of material.