You'll have a GREAT setup. I have a 835 with a Red dot and shoot a .670 Pure Gold and 3 1/2" Hevi 7's with excellent results. First off deep clean and polish the barrel. Sight in the Red dot, at 12.5 yards, with dove loads, and finish at 40 with the LB's. The .670 SSX should throw the LB 6's with great patterns for you.