My friends .50 cal Black Diamond XR with 3-9scoped with 2 /50 gr.pyrodex pellets will shoot 1.5 to 2 " groups at 100 yards. If he goes to 3 pellets they go everywhere. I think some people are driving them too fast for their rifles(brand). By the way he shoots the copper aero tip. Now if I can get him to hunt with it. This man has four muzzleloaders and doesnt go hunting with them. He barely shoots them at the range. Thats a shame.