Allen is right on about air rifle scopes. You need the ones designed for them. It has something to do with the way they kick and vibrate when shot.
I think on most scopes , you move the screw the direction you want the bullet to go. If you are hitting to the left of your mark you need to move it to the right so move the screw whichever way indicates to the right.
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Have a good one.
Texeye
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