This one might be useful, head movement isn't addressed that often.
With the combined effort of the vestibular sense, head movement and "muscle memory" one is able to far outdo the 1 degree resolution a scope bubble level usually offers.
Key to reaching this resolution was learning that the eyeballs will automatically try to straighten the sight picture and then learning to recognize what "straight" really loos like by looking at the reticle alone. I have also mounted my rifle at an angle so I can hold the rifle as my anatomy dictates - the scope is not level to the rifle stock.
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