Vortex Optics RAZOR HD GEN II 4.5-27X56 RIFLESCOPE - Manual (Page 7)

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Basic windage correction using drop line on reticle
When using the reticle for elevation correction rather than dialing, the
mrad marks on the center horizontal crosshair can still be used to help
visually reference windage corrections.
2.74 mrad correction for a target moving at 3 mph at 800 yards. No wind.
Total bullet time of flight from trigger pull is 1.5 seconds during which the
target travels 6.6 feet. Elevation already dialed into turret.
Basic moving lead correction
When estimating moving target leads, the mrad marks on the center
horizontal crosshair can be used. Estimating moving leads will require
knowing yardage distance, wind speed, moving target speed and total
bullet flight times including rifle lock time. Bullet flight times can be
roughly calculated based on fps velocities or a ballistic calculator.
Note: Correctly estimating moving leads is very difficult and requires
considerable practice and knowledge beyond the scope of this manual.
Direction of Movement
Example
Using 3 mrad drop line at 500 yards, 1.5 mrad correction for 10 mph wind.
Example
10 mph wind
Full value wind at 90 degrees