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Have just started looking at my sons 260 Rem based on late 80s (I think) Rem action serial number C6617865 in order to assess what degree of MOA rail it needs to allow for more elevation on the scope. He has a Sightron 8 -32 x 56 which appears to have almost 80 moa total range and his current 100 yard zero leaves him with 41 moa UP elevation available and then 39 moa under his 100 yard zero.......on the face of it the rail must be zero slope...I thought. However, the rail says is is 20 moa and it does look thicker at the back.......rough calc says it should be about .035" thicker for a 158mm / 6" rail. If it IS 20 moa then the scope should not be optically centred for a 100 yard zero and greater elevation should be available. I will be taking everything apart to measure rail and action properly but in the meantime I Googled Rem 700 action blueprints which appear to show the the external diameter of the action front being larger than the rear...if true then wouldn't this negate the moa rail cant? Must admit I am confused at present and any input appreciated.