With these pellets and Bisley Magnums in 4.52, which have a similar trajectory in my R10, I zero at 40 yards which gives me a zero at 20, 1 mil dot hold under at 30, one mil dot hold over at 50 and 2 mil dots at 60 yards. These are very accurate in my R10 but not so much in my Wildcat, which only really likes JSB Diablo in 4.53, but I like a heavier pellet