Talk about handloading, patterns, and commercial shells/ammo here.
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My son and I have shot his gun when he was younger with the full choke and it was a very good pattern, I don't remember the counts at 40 but seem it was in the 240-250 range, we ended up with a .575 Carlson in his gun though.
I have shot with an 11-87 full and modify chokes. I know not an 870 but is a Remington 20ga. With the full it was running 240s in the 10" and with the modified it was running 160s at 40yds.