The Mossy 835 and 935's like chokes in the .670 to .676 for most loads if you want a tight pattern.  Pure Gold, Indian Creek, Stardot, SSX and several others are a Great place to start.  These chokes shoot Longbeards, Hevi-13's well.  If you want to shoot TSS, some will say use a little more open choke.  
I shoot an 835 with 3 1/2 Hevi 13 7's and a .670 Pure Gold choke with devastating results.