RE: Line of Sight - Line of Bore Qn.
This from a website:
Mechanics
The inner workings of a scope have a direct affect on shooting accuracy. As adjustments are made during sight-in, the cam tube, which holds the reticle and lenses in place, moves inside the scope. To stay on target and produce a quality image, this tube must be strong enough to absorb the impact of heavy recoil during shooting and remain in place. When selecting your riflescope look for precision (positive) adjustments, point-of-impact consistency, reticle strength and waterproof, fogproof and shockproof durability. You'll also want to consider weight, bulk and ergonomics, which are especially important during long days in the field.
So there is this cam tube thing that moves inside the scope. If that's tru,I can see how it could be angled up and down or left/rightto varying degrees. Starting to make sense.