Shot my 870 with Rhino .660 choke and Nitro H321 (#4,5,7). Got 202 in 10" at 40 yards.
I also shot my single shot Spartan with Indian Creek .665 and the Nitro H321. Got 242 at 40 yards but the pattern was high. I can hardly wait for the Burris FFIII for the single shot. (http://img.tapatalk.com/442047e1-b18b-d65d.jpg)
(http://img.tapatalk.com/442047e1-b19c-8e3d.jpg)
(http://img.tapatalk.com/442047e1-b1b2-3e3f.jpg)
(http://img.tapatalk.com/442047e1-b1bf-a412.jpg)
I don't understand the v that the single shot threw. I only had time to shoot these two today but plan on shooting Hevi # 7 soon through both. I may even switch chokes and see how they perform in the other gun. Hindsight being 20/20 I wish I would have gotten the Nitro in straight 7 or 6.