Vortex Optics VIPER HS LR 6-24X50 RIFLESCOPE — First Focal Plane - Manual (Page 5)

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Elevation Holdovers
Once the distance has been calculated using the XLR reticle or a laser
rangefinder, the XLR can be used for rapid holdover correction for
bullet drop of the cartridge being used. To get the most benefit out
of the XLR equipped riflescope, Vortex Optics highly recommends
shooters learn their bullet drop numbers in MOAs rather than inches.
Because the XLR reticle is scaled with 2 MOA drop increments, it
is an easy job to quickly select the correct drop reference line once
the shooter knows the bullet drops in MOAs. If the shooter prefers
to dial come ups for bullet drop using the elevation knob, knowing
bullet drops in MOAs rather than inches will allow for much faster
adjustments as the MOAs can be quickly read on the elevation knob.
17.5 MOA reticle holdover for 625 yard shot. No wind.
Example