RE: How do you tune?
I paper tune to get close. I go for a slight high left tear up close that stabilizes by 5 yards and holds at 10 and 15 yards. Then I refine centershot by using a variation of the walkback method by sighting in at 20 then shooting at 40 and adjusting centershot. Then back to sighting in at 20 shootng at 40 and adjusting centershot. Once centershot is set by this method I'm almost always spot on.