I'm new to shotguns, I'm looking for real self-defense ammo. The Winchester site lists Super-X steel shot as self defense ammo but i'm not sure about it. It also listed Xpert as a self defense round but there are birds and clays on the box. I want buckshot but not 00 yet, i wanna try number 4 shot i've read good things about it. More pellets, nice spread size, thats what i'm looking for. so what should i look for?