Is this a USO? What mount?
When you say you are "out of adjustment", do you mean on the knob? You zero it by setting the knobs where you want them, say 100 yards and zero windage, loosen the set screws and adjust the large hex screws in the axis of the knobs to change the POI. Make sure the set screws are snug after you make your adjustments. Not too tight, though, or you'll put divots in the adjusting screw, and when you go to make small adjustments the set screw will find the old divot, setting the crosshairs back where they were before (Don't ask me how I know). Just snug, not gorilla tight.
And like One-Eyed-Jack said, I would do a true bore sight by sighting through the bore.
BTW, your final adjustments (parallax and zero, IN THAT ORDER) should take place at 300 yards, and AFTER you have focused the reticle.