I mounted a really cheap T-Star on mine. I peered through my sights (of which I knew were deadly) and noticed that the whole mount was off of the centre-line of the barrel. Went to the Sandlak site and noticed that they had a wedge shaped shim which was required to be fitted on the side of the receiver. That got me thinking.
I found another site with the USGI dimensions, measured up mine and mathematically calculated the width of my "wedge". The whole irony is that I took an old chinese made socket (1/2" - I think) and cut a wedge out of it 2.5 mm by about 1.0 mm.
The mounting screw fit through it and presto....the mount was centred! I then adjusted the mount vertically to an object (neighbour's roof eaves) approximately 75 yards away, using my sights as a guide.
Went out the range, and only minor adjustment (fine tuning) to scope was necessary. Also found out that rifle loves handloads and winchesters, hates Remington.
Smacks the 300 yard gongs all day long too. Since the pics, had to install a cheek riser.
Here are some pics of my final result.
