Vortex Optics VIPER HD 10X50 R/T TACTICAL ROOF PRISM BINOCULAR — R/T Ranging Reticle - Manual (Page 6)

HD R/T
BINOCULAR
11 10
Range (Yards) =
Target Size (Yards) x 1000
Measured mrads
Range (Yards) =
Target Size (Inches) x 27.8
Measured mrads
Range (Meters) =
Target Size (Meters) x 1000
Measured mrads
Precision ranging with mrads
Mrad measurements are very effective for ranging using simple formulas.
Knowing the size of the target, or a nearby object, is essential to using these
formulas.
Before ranging, be sure the reticle is in focus (see page 6). Using either the
vertical or horizontal mrad scale, place the reticle on the target of known
dimensions and read the number of mrads spanned.
You’ll obtain the maximum accuracy in ranging by calculating exact mrad
measurements—try to estimate the mrad measurement in 1/10s if possible.
To help calculate fractions of mrads, the Viper HD R/T reticle uses both 1
mrad and .5 mrad graduations on the crosshair. Fine crosshairs subtend .05
mrads.
Accurate measuring will depend on having a very steady hold. Be sure
to solidly brace the arms when measuring—or use a tripod mount for
maximum accuracy. Once you have an accurate mrad reading, use one of
the formulas to calculate the distance.
Ranging a 6-foot man (2 yards) at 4 mrads yields 500 yards.
2 x 1000
4 mrads
500 Yards =