RE: Good Turkey Ammo for Moss. 835 12 Ga.?
I have the same gun - I hunted with the tightest choke that game w/ the gun for several years. Patterned real well - no problems. Saved up some cash and bought a Comp-N-Choke for it 2 years ago. An aftermarket tube really tightened up the pattern.
I think you have a fine base right now and have options to improve your set-up.
As far as ammo - try a few different kinds if possible. I couldn't get Federals to pattern very well from my gun. I prefer Remingtons #6. I did pick up a box of Winchester HV #6's in the off-season that I plan to test this spring.