Common Formulas
Range Estimation: To find:
Range in meters = Size of tgt in inches x 25.4/height of tgt in mils
Range in yards = Size of tgt in inches x 27.77/height of tgt in mils
Size of tgt in meters = (Range in meters x .001) x mils
Size of tgt in yards = (Range in yards x .001) x mils
Size of tgt in mils = Range in m/(size if tgt (in) x 25.4) or Range in yd/(size of tgt(in)x27.77)
Moving targets: To find:
Lead in feet from center mass = TOF(sec) x Tgt speed (fps)
Lead in mils from leading edge = (lead (ft) from ctr mass x 12) -6
(range x .035)
Slope dope:
Correct distance = Gun target distance x COS of angle
Angle 10 20 30 40 50 60 70 80 90
COS .98 .94 .85 .75 .65 .5 .35 .2 0
M3A Reticle Dimensions 1 Mil Dot = .22 mil Reticle post width = .5 mil |