I've spent the evening setting my B square mounted scope on the ol No4 Mk2 and thought I'd ask advice before I alter anything permanently.

I set the rifle on a stand, and put a bubble level across the rear sight axis pin to get the rifle horizontal , mounted the scope mount, set the scope level with a distant, measured horizontal line and firmed up the screws.
Trouble is that when I pick the rifle up, the scope is quite canted, a lot.
So, I put it back in the stand and did the ol screws trick, with the butt plate screw slots lined up and a thread with a weight hanging down the middle to get a perfect vertical. I set the scope to horizontal at this point and then shouldered the rifle.
This time as I hold the rifle the reticle is perfectly horizontal/vertical but which is correct?

Naturally any time a scope is aligned using the butt stock centers when the rifle is shouldered if one is holding the rifle correctly the scope reticle will always look right because the butt is against ones cheek and being held vertically.

Is the correct conclusion here, that the butt stock on my rifle is not correctly square to the rifle and that I should go into the wrist socket and correctly align it to the vertical?

And now I think about it this has to be fixed because if I shoot with the reticle squared to the butt stock then the point of impact will be canted away from the vertical axis, a sore point if one s after accuracy.

Any thought, is my conclusion in the right area, that I need to remount/tweak/put right that the butt vertical axis don't match the rifle vertical axis and should?

Is it safe to assume the rear sight axis is a reliable horizontal line?

I checked the B Square and its not bent or any other problem like twisting as I attach it.

thanks
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