I have a Kahles MultiZero on a 300 win mag. Using a ballistics program to calculate trajectory for a 200 gr Accubond at 2900 fps I put some of those 1" orange dots at the projected impact points for 100, 200, 300, 400 and 500 yards (0, +1.5", +3.7", +6.3" and +9.1") so I could preset the marks on the turret before going to shoot at the longe ranges. With each successive elevation mark, the POI drifted to the right so that by the 500 yard mark the POI was approx 3" to the right. My question is: Is this a sign that the scope needs to be rotated slightly in order to align the vertical axis along which the scope adjustments move to the true axis of the scope and bore? In other words, when clicking on the upper turret the center of the reticle is not moving exactly vertical. Hard to explain. Do you long range shooters who use turret adjusments ever run across this problem or do you ever click up say 30 clicks and check to see if your POI is in vertical alignment with the lower group at your 100 yard zero?