Varmint Hunter, yorke-1, and CA48 are spot on.... Optical clarity, resolution, and quality of the prescription lenses on the scope are far more important than magnification.
Before I became inundated with making stuff for others to shoot, I would regularly compete at mile matches. We shot 1,000 IBS paper targets both for group size and score. I was always a group shooter, particularly at that distance. My junk would always hang below moa, with some mind blowing groups thrown in when the condition Gods were on my side. I first started with NF optics, then switched to SB. I immediately noticed that I needed less magnification with the higher quality scope that had better resolution, optical clarity, better prescription...... In fact, I would regularly shoot at 16x. I didn't intentionally pick 16x, it just happens to be the sweet spot in magnification given the conditions most of the time. One match I remember looking at the scope after shooting a group and saying holy ****, I shot that on 16x...
So, in summary, the higher quality optic will allow less magnification over distance.