I have a Super X2, 24" barrel with a Kicks Gobbling Thunder choke (.670) shooting 3.5" Winchester longbeards or supreme 2 oz #6 shot, I cant tell a huge difference in the two. When I bought the gun I borrowed every choke I could get my hands on & shot different brands of ammo (5 & 6 shot) with the intention of shooting #5 shot. I tried force feeding it #5's but the #6's always patterned better. It's been several years ago so I can't begin to name each brand choke I shot but I can tell you the Kicks Gobbling Thunder (.670) with the Winchester #6's outperformed everything else I tried. I patterned some Hevi Shot magnum blends the other day & the Winchesters still came out on top. I know every gun is different but this is what I've found.