Vortex Optics VIPER PST 2.5-10X32 FFP RIFLESCOPE User Manual

RIFLESCOPE

RIFLESCOPE

First Focal Plane | Uncapped Turrets

2.5-10x32 FFP ebr-1 RETICLE

Dual Use: Shooting Tactical / Hunting

US Patent 7,937,879

RIFLESCOPE

The Vortex® EBR-1 MOA Reticle

Designed to maximize long distance shooting and ranging abilities, the EBR-1 MOA reticle for the Viper®PSTTM 2.5–10x32 riflescope can be 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.

Note: Reticle images shown in this manual are for representation only—images vary between scope models depending on magnification and reticle plane.

2

3

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.

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.

RIFLESCOPE

EBR-1 MOA Reticle Subtensions

Fine crosshair

subtends .2 MOA

Heavy crosshair subtends 5 MOA

5 MOA	2 MOA	Gap subtends
		10 MOA

4

5