All I'm saying is I've shot better groups at 100 yds shooting 12GA slugs out of a smooth barrelled shotgun with open sights. I think there's more to your problem than ammo. Does your muzzle have a good crown on it? I bought a Remington 1100 for cheap because I was told it needed a new barrell. Problem was the end of the muzzle was never smoothed out. Just cut flush and had a sharp edge. I fixed it with a dremel tool and it shot like a champ.