I imagine we got guys here who know exactly, but my vague memory has it that Leupold bases have a pair of screws which allows sideways adjustment...Rear base, anyway.
So, if this is the case, loosen up on the right side and tighten on the left. (The axis of the scope is pointing to the right of the axis of the barrel. I usually gotta draw lines on paper to figure this out.)
First, find the center for the crosshairs. Move all the way from right to left, counting clicks or marks or turns, whatever. Then, come back halfway. That should put the adjustments at center. Then adjust the base to at least center on the target by boresighting. You can tweak the base just a little before actually using the scope's internal adjustment.
I hope I have it correct; good luck...
Art