Vortex Optics VIPER PST 2.5-10X44 RIFLESCOPE User Manual
RIFLESCOPE
Second Focal Plane | Uncapped Turrets
2.5-10 x44 ebr-1 RETICLE (moa)
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) specifications can be kept
to the tightest tolerances possible. The fine center crosshair subtensions
on the EBR-1 MOA reticle were carefully chosen to provide the
optimum balance between precision aiming and low light visibility.
2.5–10x44 riflescope 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 magnification
and reticle plane.
3
MOA Subtensions
RIFLESCO PE
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 second focal plane
riflescopes, the listed MOA subtensions
of the EBR-1 reticle are only valid at
the highest magnifications of the scope.
However, by understanding the relationship
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.
of magnification and subtensions,
ranging, holdovers, and wind drift can still be calculated at partial
magnifications. Here are some examples:
• If the magnification is set at 1/2 the full magnification, subtension
values will be two times the spec listed in the manual.
• If the magnification is set at 1/3 the full magnification, subtension
values will be three times the spec listed in the manual.
• If the magnification is set at 1/4 the full magnification, subtension
values will be four times the spec listed in the manual.
EBR-1 MOA Reticle Subtensions
Heavy crosshair
subtends 2.5 MOA
5 MOA 2 MOA
Subtension Changes with Magnification
2.5–10x44 Reticle Subtensions
RIFLESCOPE
MAGNIF ICATION
10x
5x
3.3x
2.5x
(Valid at 10x)
Fine crosshair
subtends .15 MOA
CTUAL SUBTENSION OF
A
2 MOA RETICLE SPAC E
2 MOA
4 MOA
6 MOA
8 MOA
Gap subtends
2. 5 MOA
4
5
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