RE: Good Turkey Ammo for Moss. 835 12 Ga.?
All the guys I know with the Mossberg 835 Ulti mag like shooting Winchesters. My self Included. I got mine shooting real well with Win #6 shot. But the best way to find out what your gun likes is to try as many brands as you can afford.
I also have a Comp-N-Choke in my 835.
You won't have any trouble thumping Gobblers with the setup you got. I Killed my first gobbler at 45 yards with my factory turkey choke and Winchester 6 shot. He never flopped.