Contact your scope Manufacturer. They should be able to provide you with a rough chart indicating the change in minutes (or whatever unit you prefer) depending on what magnification you've got it set at.
Example: The Sightron SIII 6-24x50 - at min power, one hash mark interval represents 8 MOA, at max power, one hash mark interval represents 2 MOA...just an example.
Most mfrs will give you that information at the very least and if you are lucky enough to have purchased a scope that is true to MOA, then you can do the math and make yourself a little chart listing the differences at different mag levels.
But as TJ mentions, if consideration is given to this, one must weigh the advantages of 1st fp vs 2nd fp...depends on what you use it for....
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