Vortex Optics VIPER PST 2.5-10X32 FFP RIFLESCOPE User Manual
RIFLESCO PE
RIFLESCOPE
First Focal Plane | Uncapped Turrets
2.5-10 x32 FFP ebr-1 RETICLE
RIFLESCO PE
The Vortex® EBR-1 MOA Reticle
Designed to maximize long distance shooting and ranging abilities, the
TM
EBR-1 MOA reticle for the Viper®PST
used to effectively determine ranges, holdovers, windage corrections
and moving target leads. Ultra precision laser etching on the glass
reticle ensures that minute of angle (MOA) specifi cations can be kept
to the tightest tolerances possible. The fi ne center crosshair subtensions
on the EBR-1 MOA reticle were carefully chosen to provide the
optimum balance between precision aiming and low light visibility.
2.5–10x32 rifl escope can be
Dual Use: Shooting Tactical / Hunting
US Patent 7,937,879
Note: Reticle images shown in this manual are for representation
only—images vary between scope models depending on
magnifi cation and reticle plane.
2
3
MOA Subtensions
The EBR-1 reticle is based on minute-of-angle (MOA) subtensions.
MOA measurements are based on
degrees and minutes: 360 degrees in
a circle, 60 minutes in a degree for a
total of 21,600 minutes. These angular
measurements are used to estimate
range and correct for bullet trajectory
drop in riflescopes. 1 MOA will
correspond to 1.05 inches at a 100 yard
distance, 2.1 inches at 200 yards, 3.15
inches at 300 yards, and so on.
In the Viper PST first focal plane
riflescopes, the listed MOA subtensions
of the EBR-1 reticle are valid at all
magnification levels. This means the
shooter can use the magnification
level most appropriate for the situation
and still have effective holdover and windage reference marks. This is
also extremely valuable in a high-stress situation, as the shooter does
not have to remember to set the scope to one particular magnification
to get valid holdovers—an action necessary with the more common
second focal plane reticles.
Estimating MOA
Although 1 MOA is very
commonly corresponded to
1 inch at 100 yards, this is
not quite correct. 1 MOA at
100 yards equals 1.05 inches.
Calling 1 MOA an inch per
100 yards may be acceptable
at shorter distances, but it
will cause a five percent error
in ranging and holdover
adjustments. This will result
in missed shots at longer
distances.
EBR-1 MOA Reticle Subtensions
Heavy crosshair
subtends 5 MOA
5 MOA 2 MOA
RIFLESCO PE
Fine crosshair
subtends .2 MOA
Gap subtends
10 MOA
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