I just picked up one of the MossBerg 410 Home Security shotguns. I bought a couple boxes of 3" RIO shells...#4, #6 and some #7.5's I don't know if its the gun or the shells but its a struggle to pump that little rascal. The RIO shells were half the price of the Winchester & remington so I guess I will pick up and try some more shells. I really like the size of the pump and the front grip so I'm going to find some ammo that will work in this shotgun.