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When shooting a rifle, windage measures the horizontal distance of the impact point from the target, and elevation measures the vertical distance of the impact point from the target. Finding the correct windage and elevation adjustments for a given distance when sighting in a rifle is extremely important for precision shooting. You can use a formula to manually calculate windage and elevation measurements to properly adjust rifle sights.
Items you will need
Rifle with milliradian (mil) markers in the scope
Identify an object of known size in inches. Look at the object through the scope on your rifle and measure the object's size in mils. Enter the measurements into the formula below:
I x 27.8 / M = Distance in yards
Replace “I” in the formula with the size of the object in inches and replace the “M” in the formula with the size of the object in mils. The formula result is the distance to the target in yards.
Aim at the target and fire three rounds. Look through the scope and note the average distance in inches that the impact point is away from the intended impact point.
Find the MOA (minute of angle) adjustment needed to correct the impact point using the formula below:
Inches / Distance = MOAs
Replace “Inches” in the formula with the windage in inches that the impact point must move to hit the intended impact point. Replace “Distance” in the formula with the distance to the target in yards. The resultant answer is the number of MOAs the scope must be adjusted to correct the windage impact point.
Repeat Step 3, except replace “Inches” in the formula with the elevation in inches that the impact point must move to hit the intended impact point. The resultant answer is the number of MOAs the scope must be adjusted to correct the elevation impact point.
Dave Wilson has been writing technical articles since 1993, including manuals, instructional "how-to" tips and online publications with various websites. Wilson holds a Bachelor of Arts in psychology from the University of California, Los Angeles and has Microsoft, Cisco, and ISC2 (CISSP) technical certifications. He also has experience with a broad range of computer platforms, embedded systems, network appliances and Linux.