I shoot an 870 SM and a Rhino .660" with #6 Winchester hi velocity Supreme 2 oz.

I found that Fiocci nickle plated #6 is awesome and inexpensive.

I have a .653" Rhino for it too that shoots the snot out of the Nitro shells, but I bought the triplex loads, and too many #7 1/2`s for my liking.

I like Comp-N-Choke better than Gobblin Thunder tubes, and would like to try an Indian Creek, but just don`t feel like I need one.