[wwbirds]

Some scopes as it has been mentioned you can calculate the full range by bottoming out the dial and counting the clicks to the far side and calculating the centre. Without mentioning a brand there is one brand I avoid because it seems to bottom out at under 40 clicks full range so half would only be 20 in either direction.
In the one instance I was 5 inches left rather than use up all my click adjustments I used the windage adjustment on the rings to realign to centre before usinfg the scope adjustments. That scope was a 1/10 inch increment so I figured 50 clicks was too much.