Vortex Optics RAZOR HD 1-4X24 (MOA) - EBR-556 MOA - Manual (Page 16)

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Shooting the EBR-556 Reticle
The Vortex Razor 1-4x24 EBR556 riflescope is
equipped with the patented Vortex EBR-556 MOA
glass etched reticle. Although this precision reticle has
been specifically designed around the 5.56x45 (.223
Remington) cartridge using a 55 gr. FMJBT bullet, it
can also be used with similar cartridges. Be aware that
the further other cartridges vary ballistically from the
5.56 round, the further off the bullet drop and windage
reference lines will be.
Because of it’s unique dual purpose design, the EBR-556
MOA reticle can be used at 1x magnification in CQB
(close quarters battle) applications or it may be turned up
to 4X magnification and used as a precision crosshair for
longer distance shooting.
These features are a function of the first focal plane (FFP)
reticle design used in this riflescope. Other benefits
to the FFP reticle are accurate use of the ranging and
windage features at all magnification levels and increased
reticle durability due to being located at the spring
suspended end of the internal erector tube mechanism.
Also, because of the reticle location a FFP riflescope
will have zero point-of-impact shift as magnification is
changed.