I use to hunt buckshot in NJ when that was all you could use and liked OOO Over OO, I think you gain 10 yards and feel real comfortable at 50-70 yards. Check on that full choke stuff. i believe buck shot compresses as it goes through the full choke restriction and the reverse happens as the pellets leave the barrel causing a bigger pettern spread. Striper Phil EMail ne on the spring effect if you want more info. You should pattern bolth ways.