My SBEII has a 24" barrel, with those shell's the I.C .665 did the best 170-190 in a 10" at 40yds. I have a kicks .655 that i'm gonna try in it when the weather gets better. Here's the other chokes i have tried with those loads. jellthead .660 -114 , Pure Gold .670 -148 , comp n choke .658- 122, final strut .655-116 , .660-135 , .665-140 , As you can see this gun does't pattern the best.