I have the 10 gauge 3 1/2 inch SB2. I had a horrible time trying to get the factory choke to pattern well. I did a lot of research before deciding on the Kick's Gobblin Thunder (.690 for #5 shot). At 40 paces, I'm consistantly placing 50-60 pellets in the Head/Neck on a Shoot-N-C target. I can't wait for April 15th when the season opens in KY!