Re: 3+ INCHES high @ 0 clicks
Most scopes do not have the elevation range exactly equal above and below center. There is often a little bit of difference. The NF NXS 12-42 has 45 moa of total elevation; the BR 12x42 has 42. Even if the elevation range was exactly split above and below center ( the optical axis of the scope), you would have only 2.5 moa left with the NXS, and only 1 moa left with the BR, for down adjustment. If your particular BR scope (if that is what you have) has, let's say, 19 down and 23 up, you would be starting at least 1 moa high no matter what you did. So, you might have been unlucky enough to get a scope that was even more skewed in the division of elevation between up and down than even that. If this is the case, you can either put the scope on a different rifle, and hope that the receiver is dimensionally different enough that it all works out, or you can get a 10 minute or 15 minute base, or get a 17 minute base custom made, or you can just learn to mentally adjust at the closer ranges for what your scope does.
Good luck!