Vortex Optics RAZOR HD 1-4X24 (MOA) - CQMR-1 MOA - Manual (Page 10)

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The CQMR-1 reticle can be used for approximate range
estimations using a simple formula:
Ranging Distances with the CQMR-1 Reticle
Once you have an accurate MOA reading, use the formula to
calculate distance.
To use this formula, you will need to know the size of the
target or nearby object in inches. Begin by turning the
magnification up to 4x. Using any part of the inner crosshair
with listed MOA dimensions (diagram below) to match up
to target object, estimate the number of MOAs spanned by
the object. Depending on the size of object, you may have
to visually estimate by comparing to 1/2 or 1/3 of a listed
subtension specification.
Maximum accuracy in ranging will be obtained by
calculating MOA measurements as closely as possible and
will depend on a very steady hold. The rifle should be
solidly braced using a rest, bipod or sling when measuring.
Ranging a 6-foot target (72 inches) at 30 MOAs to get 240 yards.
72 x 100
30 MOA
240 Yards =
Example using Close-up of Center Crosshair
Target Size (Inches) x 100
Measured MOA
Approximate Range (Yards) =
CQMR-1 Subtensions
of Center Crosshair
50 MOA
0.5 MOA Dot Diameter
2 MOA 0.75 MOA
1 MOA Gap
20 MOA 30 MOA