I put 135 pellets in the 10" at 40 yards with my Remington 870 youth 21" barrel and a SumToy .562-5 choke and H-13 #6's. That choke is actually made to shoot the Federal HWT's, but it shoots the H13 better. The Federals average around 120 in the 10.
The H-13 #7's put up some ridiculous numbers in my gun the other day, but I wouldn't hunt with them due to the lack of pattern consistency. There were too many holes in the patterns. I believe the 7's were in the 160's at 40.