I got 160's with that same gun but i use several different choke and the was the best. My SBE2 really shoots H-13 6's , 7's well with the Final strut .660, .665 chokes and win.xtend range with the I.C .665. I know there are several guys that shoot those shells with good results from there SBE2's
You might wanna ask this in the guns forum you'd probably get more response there.