I have a buddy that shoots these in an 835, great patterns and a hard hitting load
For whatever it's worth to anybody thinking of using the Federal flight control wad with real black powder.
I tried using them in a blackpowder shotshell gun and have 2 friends that tried them in smoothbore muzzleloaders.
none of us had any luck with the back pedals on the wad opening reliably with black powder, most loads hit the paper like a slug. 2 guns were cyl. bore, 1 was imp. cyl.