Re: NP-RR1
Do you mean the NP-1RR?
If so, it is a "known size" based ranging reticle that works with deer based on an average deer brisket-to-shoulder size of approx 18". When viewing through the scope, a deer that is approx. 300yds away will have a brisket-to-shoulder that fits between the baseline of the scope and the top of the line (top of the circle) on the far right ranging area. The ranges increase by 100yds from 300yds out to 800yds moving from the far right to the far left ranging areas on the scope.
As for the power...you range with the scope on the highest power on the 15x and 22x model scopes and all the higher powered scopes range at the 22x magnification.
If you need a more detailed explanation, Nightforce used to put a PDF manual detailing each of their reticles on their website. I haven't looked in a while, but check their library.