Civilians don't go around chasing criminals and shooting them inside cars, for example. Nor do civilians go up against criminals that have barricaded themselves.
Bubba would never barricade himself behind my couch or heavy chair requiring the penetration offered by 00 buck, and a hold up man in a small family owned store, or jewelry shop, would lnever duck behind cover. If you want to stick with #4 then I'm ok with that. Use 7 1/2 birdshot if you like. Remington just came out with the "Ultimate HD" ammo. It's what I use to hunt geese with. Load your HD shotgun with that.
LE has plenty of specialized ammo to meet their needs, but a shotgun loaded with buck is limited in that capacity--civilians and cops included.