I have to totally disagree with this comment. I have a Nightforce NXS 5.5-22X. The holdovers are only accurate at 22X which is too much on a hot day. The mirage is awful. I was told I should get the 15X when I purchased my scope, but I thought I needed the extra power. I really wish I would have listened. My next scope will be the 3.5-15X FFP scope from Nightforce. 10X will easily get you to 1000.
I know many people who shoot long range with the 15X Nightforce. It's plenty.