I've put Federal Critical Defense in my 870 recently, but I haven't fired any yet. Regarding bird shot. Not my first or second choice, but if that's all I've got, that's what's going down range, and in close quarters, like a house, I wouldn't want to be at the recieving end. MHO you understand.
Never argue with an idiot in public. People passing by won't know which one of you is the idiot.