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Vortex Optics RAZOR HD 5-20X50 RIFLESCOPE — First Focal Plane User Manual

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When using the reticle for elevation correction
rather than dialing, the windage dots will be used
for windage and moving lead corrections. The
windage dots are graduated in .2 mrad increments
and provide increasingly greater span in the lower
part of reticle, corresponding to the need for
greater windage correction at longer distances. The
supplied windage dots will at least accommodate a
20 mph crosswind for most popular high-powered
applications. Remember to hold the reticle into the
wind.

Basic windage correction using drop line on reticle

4.2 mrad reticle windage correction for 20 mph wind at 800 yards
using 7.7 mrad reticle drop line.

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20 mph wind

Full value wind at 90 degrees