Been wanting to try these and finally found a box local. Shot them out of 2 guns. A 870 Youth and an older 870 SPS with the factory fiberoptic sights made a few years ago. Both had 21" barrels. Both were snaked before shooting.
Only shot 3 shells because I was in a rush and the distance was 40 yards lazered.
The 870 SPS using Remington Super Full gave me 151 pellets in a 10" circle
The 870 SPS using Longbeard Choke 568 gave me 129 pellets in a 10" circle.
The 870 Youth using the Longbeard Choke 568 gave me 180 pellets in a 10" circle. That picture is shown below.
I'd say this would work for the youth gun, but not for the SPS. Still need to keep looking for a better choke for that gun.