When I lived in a state where only shotguns were legal I tried a lot of different buckshot rounds out of a lot of guns. I never had a federal shell pattern well. Always had best luck with 3 inch Winchester or Remington 00 15 pellet loads. The plain lead tended to pattern better than copper plated too. 4 buck always shot good right patterns but the pellets are so small it was only good on real tight quarters. Thanks