I have an 835 with a 24" ported barrel, I use a Pure Gold Choke with Win XR 3" #6s or Win HV 3" #6s. To be honest, with th3 835/PG combo, with just about any shell you run through it will easily kill a turkey out to 40 yds, obviously some better than the others. I've tried a jellyhead, StarDot, Indian Creek .690, Kick's, and HS Undertaker in that gun and the Pure Gold is what I liked the best. The other chokes shot some pretty good patterns as well, but I like how evenly distibuted the PG patterns are. Good luck with whatever you go with.