Exaggerate the issue to see the geometry. Kant the rifle 80 degrees clockwise, mount the scope so the HZ crosshairs are HZ. Zero the rifle at 100 yards lets say while holding the scope "level". Lets assume the rifle is very accurate and groups well within a minute of an angle.
Shoot at a 400 - 500 yard target with no hold over. Where will the bullets impact? How many think they'll be low but inline with the vertical center line of the target (more or less)?
How many think they'll be low and to the right of center?
Assuming they'll be right of center, if you re-zeroed at 400 where will the bullets impact at 100? High only or high and left?
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