I did alot of research and brought the Indian Creek Turkey Choke, other choke tubes are excellen as well. But I just found for me the Indian Creek and HeviShot 13 #6 would be pefect for my Mossberg 835

Here is the link for: http://www.indiancreekss.com/home.htm
And for the ammo: http://www.hevishot.com/products_turkey.html