Going a few thenths of a Mil or a few quarters of an MOA past zero is not an issue.
The whole point in a zero stop is to prevent you from going A FULL REVOLUTION past your zero. Once you've dialed up so far you forgot what rev you were on (and you fail to look at the rev indicator line on the scope body) you can dial down until your turret stops and know you are on your zero. So when it goes two or three tenths or quarters past zero, dial back up to zero.
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