Hornady makes a #4 buck load using the VersaTite wad which is essentially identical to Federal's FC wad. However I've not been able to get near as good of a pattern with them. They are 1350 velocity and they don't use a buffer in their shot column and it shows on the patterning board. I was hoping to get a solid 50 yard coyote load out of them. Nope. 30 yards at best.
I also don't get as good a group with the full power Fed FC but it's buffered so it's better than the Hornady. The low recoil has about the perfect storm going on for tight patterning as long as you run it out of a true cylinder barrel. Lower velocity doesn't strip the wad away from the shot as fast.