Vortex Optics VIPER HS LR 6-24X50 RIFLESCOPE — First Focal Plane - Manual (Page 8)

15 14
15 14
Basic moving lead correction
The MOA marks on the center horizontal crosshair and the windage
dots can be used to estimate moving target leads. 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 calculated using a ballistic calculator.
Note: Correctly estimating moving leads is very difficult and requires
considerable practice and knowledge.
9.5 MOA reticle correction for a target moving at 3 mph at a distance of
800 yards. No wind. Elevation adjustment already dialed into riflescope.
Example
3 mph
In this example, the total bullet time of flight from moment of trigger pull
is 1.5 seconds—during which a target travels 6.6 feet. Elevation already
dialed into turret.