Most 835's LOVE chokes in the .670-.680 range with ALL loads. Anything under .670 and the pattern will be blown and above .680 the pattern begins to expand. The guys on this site have done their homework with the Hevi-7s and Longbeard 6's and the .670 Pure Gold, .675 Indian Creek, .675 Sumtoy, .676 SSX and .676 Stardot are Winners. I shoot the Pure Gold with Hevi 7's and she puts over 300 in 10 at 40. Check out the Mossberg Pattern posts and you will see some of the results with PICS. Good Luck.