Vortex Optics RAZOR HD 5-20X50 RIFLESCOPE — First Focal Plane - Manual (Page 6)

When using the reticle for elevation correction rather than
dialing, the MOA marks on the center horizontal crosshair
can still be used to help visually reference windage
corrections. Remember to hold the reticle into the wind.
Basic windage correction using drop line on reticle
When estimating moving target leads, the MOA marks
on the center horizontal crosshair can be used. Estimating
moving target leads will require knowing yardage distance,
wind speed, moving target speed, and total bullet flight time
(including rifle lock time). Bullet flight times can be roughly
calculated based on fps velocities or a ballistic calculator.
Basic moving lead correction
9.4 MOA reticle correction for a target moving 3 mph at a distance of
800 yards. No wind. Total bullet time of fl ight from trigger pull 1.5
seconds during which the target travels 6.6 feet. Elevation already dialed
into turret.
20 mph wind
Full value wind at 90 degrees
Moving Direction
8 MOA reticle windage correction for 500 yard shot in 20 mph
crosswind using 12 MOA reticle drop line.
Note: Correctly estimating moving leads is very diffi cult and requires
considerable practice and knowledge beyond the scope of this manual.
Example
Example