In order to make those LR/ELR (800yd to beyond) cold bore, first round hits, making a correct wind SWAG (sophisticated wild a** guess) is critical, so how and what criteria does everyone use to make those best wind calls? Flat land vs mountain-canyon shooting. Also, which section of the range do you place the most emphasis on and rationale? I.E. only the wind speed at the muzzle, first 1/3, half, last half, etc.