i have tried a 180 sabot with 90 gr of shockys gold powder. at 50 yards i can punch the center of the target every time, but at 100 yards it is 18 inches low and about a foot right. tryed 3 different scopes always same results. Also tryed 275 gr power belts with same problem. cleaned good between tests dont know what else to do.

Are the holes in the paper round or oblong? Do you know what the rifling twist rate is?

Just a suggestion here.......if it will group at 100 yards then sight it in at 100 and then see where it is hitting at 50...just curious

the holes are round and the twist is 1 in 28