I have a 535 with a 22" barrel, and have a Carlson's Longbeard .660 choke tube. With 3" #5 Longbeard with 1 3/4 oz I'm putting ~185 at 40 and ~95 at 60. I was satisfied, and have not yet tried #4 or 6 Longbeard, nor have I tried 3.5" yet. The factory choke that came with the gun was not any good regardless of load. So far, 3 shots and 3 birds. Tagged out in GA this morning