http://www.youtube.com/watch?v=CSOWpy5OKSc&feature=related
Let this break all birdshot myths, both for wall penetration and tissue damage.
Guys, birdshot is no joke real real close, we're talking under ten yards. Yes, it could kill someone. But there's also the chance that it won't kill the person.
Now, seeing as either birdshot or buck will penetrate a wall, I prefer 00 buck for inside shots, or outdoor shots 25yds and under. I live on fifty acres, so as Roscoe stated, there's a very real chance of me taking some rounds from distances greater than 25 yards from outdoors.
If that were to happen, I'm not going to run back to the closet, change weapons, restock my pockets with ammo, and try to re-acquire the target, all without getting popped myself.
Instead of that nonsense, I'm going to duck back, load up some slugs, and tag the perp. Were this a residential setting, I'd probably still do the same, because lethal force is authorized in self defense OR defense of human life.
Howerever, I ain't dumb enough to pop off some slugs into little kristinas's house because A bad guy is shooting from their garden. Tactics, gentleman, tactics.
Situation dictates, right?
And how about common effing sense.