I have a Star Dot choke that is no longer made on my 835. They were sold by a lot of Walmart stores throughout the 90's. They were made by Highlander Sports. The one for the 835 is .676 constriction and they throw devastating patterns with the Hevi-13 loads. They are hard to find now. But I would tell you that Indian Creek makes some great chokes. I have 2 of them for my 870 and they both shoot unbelievable patterns. My guess would be a .675 Indian Creek choke would make your 835 a pure shooter with Hevi-13 loads.
I'll show you why I like the Star Dot choke on my 835 with a picture of a 10" circle I cut out from a big piece of cardboard that I always use to pattern with. This was shot a tape measured 40yds. This was using the Hevi-13 3.5" 2 and 1/4oz #7 load.
