Ok, Many people may slam me on this one but here goes.
I have seen many bullets penetrate several walls, enter neighbors houses, etc. (9mm, 357, 30-30) I have several people in my home. I worry about shooting past my target, through a wall and hitting an unintended victim.
So, I'm thinking, bird shot would be effective at close range (in a house) but that it likely would not penetrate through walls and maintain lethal force coming out the other side.
If you think this is a viable alternative, what size shot would you use?