I pattern a couple last year Hevi-6 out of a 20 gauge youth 870 and they were fine...they don't have as much energy as the Federal HW 7.. the choke i'm using is Trulock 565 , no-ported ...i was looking for a choke that was good to shoot more than just one shell...with the Trulock , i can shoot 7-6-5 pretty good...