Well I think you will get some great patterns out of either a Indian Creek .670 or maybe even a .675. I like my .669 Indian Creek BDS choke. I have a 28' barrel. I am getting my best results with the Hevi-13 #7 loads in the MAD Super Max .675 choke without the wad stripper feature. It's about the same as the newer Indian Creek chokes and it's made by Indian Creek. If you want to try a very good shooting choke, the Rem Ventilator is a very good choice for less than $24 shipped to your door. I can give you the link if you want it. Pure Gold makes a good choke, too. But all of these would be good choices.