Of interest at SHOT Show 2020 is Trijicon's Ventus combined rangefinder and Doppler LIDAR handled system. The Ventus X adds a ballistic solver.
The term “zero” means finding a sight setting that, under some set of conditions, results in a centered shot group. Those conditions include distance, ammunition, and event. Other variables that factor in include rifle, temperature, atmosphere, place, yet the list can continue.
It's just a mirage! This article will help you learn an old technique that will help you at the range to discern the wind up to 15 mph