I have a code black duck in my SX3. With my gun and that choke, it patterns 3 inch 3s best, but 2's 1's, and bb's pattern ok at 40. Getting accustomed to how much lead to give with a full pattern takes a little getting used to, it is less forgiving than a modified pattern. Once I got it sort of figured out, I have been happy with it. Every gun will pattern a bit different with every choke tube, there are always minor differences in guns of the same model from any manufacturer. Best thing I can tell you is that if you have a friend that has one that will fit your gun, try it and see how you like it, but be aware that if you buy your own, expect some minor variation. And try several different shell brands as well, some gun/choke combo's just don't do well with some shells. Mine like Heavy Steel, Win super X, and Monarch's, but does not like any Federal shells, especially Black Clouds. Some folks shoot em all day long and love them though.