Experts say with the very high BC bullets, great ballistic calculation tools, and 2000+ yd laser range finders available today, wind reading ability is what really makes the difference between good ELR shooters and great ones. Please see http://forum.accurateshooter.com/threads/scope-based-wind-speed-estimate.3939875/ on the Main forum page for a scope-based tool that might help you or your spotter when you don’t have wind flags downrange.