I have had great luck mounting scopes on high powered rifles, finding zero with reasonable number of rounds and ethically/quickly killing game out to about 275. I kind of fell into a 6.5 prc European rifle with a >moa guarantee. Put a Leupold 3xi 6.5x20 (SFP) on it. First round at 25 high and left. Corrected for windage and lacking capacity to reduce elevation held low to find a nice 3 shot group .5 moa from the bull (just left and low). Figure I was good. Go to 100 yards and cant find paper. Return to 25 and get a good group on the bull holder 3 moa low. Move to 50 yards and the thing throws a round at the top of the paper. Depress hold to the bottom of the target paper and round hits 4.5 moa hi. Depress to bottom of backing and get to 2 moa high. Try another round an get 3 moa. All from solid bench rest, great sight picture. There is no fool like an old fool and I am feeling like one of them. I must be missing something here...