Has anyone here ever tried a method called french tuning. It would almost be the same as walkback in a way. You get the center shot close and shoot at 3 yards and adjust your sight to hit right on at 3 yards. You then get to 60 yards and adjust your sight to hit right on at 60, after this the only adjustment you do at 3 yards is to the rest and the only adjustment you make at 60 is with the sight. You keep going back and forth until all are aligned at both 60 and at 3 yards. This should put you right on provided that your second axis has been set.