Once you know where to position the scope fore and aft for proper eye relief and full view, put the rifle in a cradle or gun vise, if you're using normal rings, place a small level across the top of the bottom ring half and get the rifle plumb, then lay the scope in the rings. Hang a string anywhere from 15' to 25yds away with a weight on the end, align the vertical X-hair with the string, tighten the ring caps and boresight. /ubbthreads/images/graemlins/grinning-smiley-003.gif