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Target Height
To estimate a range with a rifle scope, you need a target of known height in meters. Estimating the range requires an algebraic equation with one unknown variable--the range--so the target's height must be known.
Ranging Marks
The second known variable in determining range is the number of tick marks from the base of your target to the top. To determine an accurate count, line up the horizontal reticle with the bottom of your target and count the number of tick marks to the top; if the top does not line up with a tick mark then estimate the percentage of the interval. For example, if the top falls halfway between tick marks record it as 0.5.
Range Equation
Divide the target height by the number of tick marks to the top of the target and multiply your answer by 1,000. If ̶0;A̶1; is the target height, ̶0;B̶1; is the number of tick marks and ̶0;C̶1; is the range, your equation would look like this: (A ÷ B) x 1,000 = C.
An Example
Let̵7;s say the target is two meters high and the tick mark count is one. Your equation would be: Two divided by one, equaling two, multiplied by 1,000, equaling 2,000. Your range to target is 2,000 meters.
Distance Conversion
The rangefinder is designed to give you the range in meters. To determine the range in a different unit of measure you must convert it. For instance, 1 meter equals 3.28 feet, so if your distance is 500 meters, you would multiply it by 3.28 for a distance of 1,640.4 feet.