Anyone use a final strut choke in there SBEII? what shells pattern the best with this choke for you? I have tried jelly head .660 , pure gold .670 , comp-n-choke .658 , and Indian Creek .665, all with H-13 and win.elite xtend range #6, 3" and#3.5", My very best average is 170 in a 10" circle with the win, elite xtend range.