Another way of thinking is the Gravity determins the drop so as long as the scope is level to the earth (verticle not level to the slope of the ground) the amount the scope is out to the rifle is only going to be sending the bullet on a slightly out to one side parralell to the scope.
If you use a level mounted on the scope it has to be correct to the scope cross or it will have a far greater affect as you will be second guessing your eye and holding it with cant to get the levl correct.
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