I didn't realize that you were shooting guns with fixed chokes. That does indeed limit you as to what you should shoot. Having said that, I would definitely try Hevi-Shot. It seems to pattern better than lead in some people's guns. With the fixed chokes, you'll need all the help you can get with patterning. I would try the #6's in Hevi-Shot in both guns and see what kind of patterns you come up with. I would lean toward the single shot with the full choke as the one that'll give you the best patterns with the Hevi-Shot. Good luck! Simp