I used to shoot the older Federal Mag Turkey loads 5's where my favorite out of the 4's,5's and 6's that I tried with my set up. 870 Remington 28" barrel and a Kicks .665 choke. When I ran out and needed to buy some more they had switched to the flight control wad and my gun didn't shoot any of them very well at all. I found my gun liked the Remington premier magnum 2oz #5's. I have not tried any of the Hevi shot type shells just can't justify the price of those shells over the pattern that I am getting now.
These Ozark Mountains Ain't High But The Hollers Sure Are Deep