I recently patterned my sbe2 with #2 shot 3.5" with factory chokes, briley x2 chokes and the briley bc choke and the carlson black cloud chokes. At forty yards briley x2 light modified performed the best with 150 evenly placed pellets in a thirty inch circle. I would call a tie between the carlson bc extended and the stock modified. Placing around 140 pellets in the circle. The carlson extended maybe a little tighter but only slightly. Hope this helps.