Vortex Optics RAZOR HD 5-20X50 RIFLESCOPE User Manual

Vortex EBR-1 MOA Reticle

The Vortex Razor HD 5–20x50 riflescope is equipped with the Vortex EBR-1 MOA reticle.

Designed to maximize long distance shooting and ranging abilities, the EBR-1 reticle can be used to effectively determine ranges, holdovers, and windage corrections. Ultra precision laser etching on the glass

reticle ensures that MOA specifications can be kept to the tightest tolerances possible. The fine center crosshair subtensions on the EBR- 1 reticle were carefully chosen to provide the optimum balance between precision aiming and low light visibility.

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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. Many shooters

are very familiar with the MOA system used in hunting

riflescopes. 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.

When used in a first focal plane

riflescope, such as the Vortex Razor HD riflescopes, the 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 extremely valuable in a high-stress situation because

the shooter does not have to remember to set the scope to one particular magnification to get valid holdovers—an action necessary in the more common second focal plane reticles.

Fine Crosshair

Heavy Crosshair

EBR-1 Reticle Subtensions

2 MOA subtension marks	Crosshair thickness
	Fine: .2 MOA
	Heavy: 5 MOA
5 MOA subtension marks

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Ranging

MOA measurements are very effective for ranging using a simple formula. To use this formula, the shooter needs to know the size of the target or nearby object in inches.

MOA Ranging Formula

Target Size (Inches) x 95.5

=	Range (Yards)

Measured MOAs

Using either the vertical or horizontal MOA scale, place the reticle on a target of known dimensions and read the number of MOAs spanned. You will obtain

maximum accuracy in ranging by calculating exact MOA measurements. MOAs should be estimated in 1/4s if possible. To help calculate fractions of MOAs, the inner crosshair line thickness can be used as a reference. All inner line thicknesses subtend 1/5 MOA.

Accurate measuring will depend on a very steady hold. The rifle should be solidly braced using a rest, bipod or sling when measuring. Once you have an accurate MOA reading, use the formula to calculate the distance.

Example

Ranging a 6-foot target stand (72 inches) at 12 MOAs yields 573 yards.

72 x 95.5 = 573 Yards

12 MOA

Note: In the MOA ranging formula, a shooter may substitute 100 for 95.5 in the interest of speedier calculations. Be aware that this will produce a five percent over-estimation error of the yardage distance obtained.

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