I think I've gotten a dud. I have a Zeiss Conquest 3-9x40 Z -600 that I've mounted on two different rifles, and with the windage cranked all the way right, it is still shooting 4" left, AND the U/R on the elevation seems to have the reverse effect (up=down, vice versa).
At first I thought maybe I'd messed up, but after the exact same problem on 2 rifles I believe I may have gotten the rare lemon from Zeiss.