Definatly try the #5's federal flite controls. I got a great pattern with these. I shoot a Mossberg 500 with the Mossberg XX full choke also and was getting 125 pellets in a 10 inch square at 40 yards with 25 avg in the kill zone. Definatly beat out all other shells ive tried. The #4's did not shoot that. The heavy weights also didnt shoot that well.