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Is there any vertical shift?
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The bore of a rifle is angled upwards with respect to the sight line. That upward angle is to "fight" the effects of gravity.
Without that upward angle, the bullet would always hit below the line of the bore.
Canting the rifle takes some of that upward angle and converts it to an angle in the horizontal plane. The obvious effect is that the horizontal component will cause the bullet impact to move in the direction of the cant.
The less obvious effect is that because some of the upward angle that was supposed to fight the effect of gravity is now doing something else (moving the bullet impact to the side), the bullet will now impact lower on the target.