"Their actual position is always the "upwind" side so key off that." So...how far upwind might the target actually be in the wind I described above. What is the range in MOA that it might be upwind --- roughly?
In addition to holding left or right for wind drift, how much will mirage affect my shot by making the target appear to move over to one side or the other? What is a typical mirage-induced range of apparent target movement at 5 mph and at 700 yards in bright sunny conditions?