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What happens to scope squaring when long shots require a 40 MOA tapered base? If you align scope reticle square to receiver you've only leveled it sideways.
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Yes, exactly. The reticle should be leveled to the bore (not the receiver) so that there is no left to right parallax. There is already a verticle parallax and it's of no concern. When you adjust the reticle on the scope to zero your rifle, you're already causing the barrel to be angled up. This is why the bullet travels in an upward trajector, reaches its peak, then begins to descend; crossing the line of sight twice. Angling the scope is of no consequence. It simply puts the barrel at an even greater angle upwards allowing for longer shots.
The vertical parallax is okay and expected. It doesn't matter if you exaggerate it with a 40 MOA rail. Because of gravity there will always be a variance in the point of impact on the vertical axis at different distances.
The point is that there must be NO horizontal parallax. The bore must rest directly below the reticle to prevent left to right change of impact at various distances. This is also necessary to ensure that the rifle will actually track left to right or up and down properly.
Also, from what you said above, I get the impression you are thinking of leveling the scope along the length of the receiver. That is not what is being discussed AT ALL.
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on a 3'x3' target, perfectly leveled crosshair, always aimm at the crosshair in line with target
at 200M
5shot grouping center
-6moa elevation, 5 shot grouping
return to zero then, +6moa, 5 shot grouping
top grouping should tell wich side the scope is canting, assuming the elevation only moves the elevation.
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Yes, exactly. This is easy to see at the range. If Dale isn't seeing it, his reticle must be pretty damn close to being directly over the bore.