While not long range I have a canting problem. My 250-3000 is zeroed at 100 yards 0.8" high and dead centre. A few days ago I checked zero at 200 yards and it was 2.5" low (expected) and 2.5" to the right. Today I shot the same load at 200 yards with the rifle canted off to the left at approx. 20 deg. ie the scope centreline was on the left of the bore centreline. The group was 2.5" low and dead centre. Clearly the scope is not perpendicular to the bore. Which way do I rotate the scope to correct this ?