Note: The (Right) and (Up) directions are where the screws are backed off and the scope uses only spring power to move the reticle. When moving Left and Down, screws move the reticle against springs, so there is less tendency to need tapping to set them.
That's another reason to have a Sight-Vise at the range. Clamp the rifle in with the crosshairs on the center then, while looking through the scope, turn the adjustment knobs. It will soon be apparent if they're sticking and in need of tapping, or just backing off several clicks, then returning to the proper location by screw pressure.