I just sighted in my gpr a few hours ago. I had it dialed in for the past couple of years and for some reason this time it shot low at 100 yards. So I practiced at 50 yards for awhile and it is stacking round balls at that range. Went back to 100 yards and it is shooting about 6" low. I think I am going to leave it there. I should be able to get within 50-75 yards of a deer, but if I cant I will just have to remember that magic mark at 100 yards.