Originally Posted by OctoberRust
Understandable if you were defending yourself and had a full frontal shot of your attacker/home invader. What about if all you have is a side shot? What if he's taking cover behind your couch and about to throw rounds down range toward you? Then all of a sudden it seems the camp of "limited penetration for liability issues" becomes moot, since the bad guy may be using something that goes through multiple walls, etc.
Using your scenario of "what ifs", what if the BG was hiding behind the refrigerator, what if there was a cinder block wall, what if, what if, what if. The world is full of 'what ifs'. I can tell one thing from having BTDT-wore out the t-shirt. No matter what gun you have when it hits the fan you quickly realize 1) yours isn't big enough, 2) you are sure you don't have enough ammo, and 3) the bad guy's gun seems a lot bigger than yours.
My point was don't underestimate bird shot. It will kill you just as dead as a slug and you won't be able to tell the difference. It's not a load I would recommend but I've read too many internet commandos on here and other forums that don't have a clue just how quickly dead bird shot will kill someone.