I received the patternamaster choke last week and I am sending it back tommorow. It didn't hold a tight pattern on any of the shells that I tried, (except buckshot). I tried 5 different shells and 3 different brand names, I guess my 870 supermag didn't like the PM superchoke. I was wanting to use this choke as an all around choke, deer, turkey, duck, whatever. Hope your luck w/ the patternmaster is better than mine.