Lt. Werner: Formulas Reference Sheet


Mildots

(Target size in yards * 1000) / Target size in mils = range (yards)
(Target size in inches * 27.778) / Target size in mils = range (yards)

Angles

range * cos(angle) = horizontal range

Moving target: target speed

speed = distance / time
(Distance in mils * ( size of 1 mil at target range / 12 ) ) / time in seconds = target speed in fps
speed in mph * 1.467 = speed in fps

Moving target: time of flight

(2 * range in feet) / Muzzle velocity + velocity at range = time of flight (seconds)

Moving target: lead

Time of flight in seconds * target speed in fps = lead in feet
(lead in feet * 12) / size of 1 mil at target's range = lead in mils

Moving target: wind

If the wind and the target are moving in the same direction:

wind speed - target speed = wind speed to correct for

If the wind and the target are moving in opposite directions:

wind speed + target speed = wind speed to correct for

© Lt. Werner 2014 (www.ltwerner.com)