I had a customer bring me a 7600 a couple of years ago that was scettering shots all over the where . Turned out the barrel was loose , right from the factory ! Tightened up the barrel , and it came right into it . I have never encountered the problem you described , and I've worked on a hundred or more 760s & 7600s . When you say it was off at each distance , you didn't specify windage or elevation . Elevation would be adjusted with shims , if need be . Windage can be corrected with windage adjustable scope bases (Leuplod adjustable rear) or Millet Angle-Lok rings ! Once in a great while , for whatever reason . the receivers on some of the 7600s made in the last 5 years , have holes that are less than perfectly aligned . As a rule , if you can attach the base without having to move anything , it can be aligned . I would have liked to have seen yours !