Vortex Optics VIPER PST 4-16X50 FFP RIFLESCOPE User Manual

RIFLESCO PE

RIFLESCOPE

First Focal Plane | Uncapped Turrets

4-16x50 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) 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.

4–16x50 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.

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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 .21 MOA

Gap subtends
10 MOA

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