Is driving me mental!!!
I resorted to using the feeler gauge technique but because I have an after-market weaver rail on the gun, even that is giving me problems because when the pressure is equal on both sides, the ret is slightly off.
I've resorted to moving it by the thousandth of an inch and then shooting at 130 and 300 yards to test it... I seem to have fixed it at last tonight
I don't mind being out an inch or two but now that I have switched to the high mag Nightforce, I'm back shooting at 400 yards plus and the inch or two out at that range is significant.
Why isn't there a simple and absolutely perfect tool for this job