I think I got it.
When you move your head from shot to shot, there will be a difference in position since the crosshair is almost never directly in the optical center of the lenses.
Moving the scope foward would theorically REDUCE this effect because the angle at which the light will come in is less.
Problem is that every scope as a specific distance from the eye where field of view is optimal. That is the "perfect" distance to aim.
Only GOOD solution is to adjust your cheek rest carefully, and take a good aiming habit. Just come to the same position everytime.
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