I am betting zero lock is engaged. You rarely see a Nightforce that is properly mounted run out of adjustments. Speaking of properly mounted; Optilock rings are susceptible to not being properly setup in the dovetails. If you have a culminator handy put it on and move the rings back and forth in the Dovetail to get the best alignment with the crosshair, making sure you have the front ring on the front, because that too will mess with the setup.
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