Xbr c – Vortex Optics VIPER XBR 2.5-10X44 CROSSBOW SCOPE User Manual

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For the best long-range ability, Vortex recommends a 30-yard zero on the
center crosshair. Begin the initial sight-in at a distance of 8 yards. Due to arrow
trajectory, this will also closely equal the desired 30-yard zero. Points of impact
between 8 and 30 yards will be just slightly high and may be compensated for
by holding point of aim on the first reticle tick above center. Once you have
mounted your XBR scope, use either the reticle or ruler method to sight in your
scope.

Sight In Method Using the Reticle

Step 1

While looking through the scope, use the reticle hashmarks to measure the
distance the arrow missed the bullseye. Set the magnification to 2.5x then
aim and shoot for the bullseye at a distance of 8 yards. Try to keep your
eye centered behind the eyepiece in order to reduce the effects of parallax
at this very close range. Most likely, you will not hit the bullseye with this
initial shot. Important Note: Hashmarks as seen in the reticle are marked in
increments of 5 MOA, but at 2.5x these increments actually span 20 MOA.

Example

When looking through the scope, the arrow
strike is 1 hashmark high and 2 hashmarks to
the right of center.

1. Calculate amount of adjustment needed:
Elevation: 1 x 20 MOA = 20 MOA
Windage: 2 x 20 MOA= 40 MOA

2. Adjust the turrets (each click equals 1
MOA):
Elevation: Rotate turret down 20 clicks.
Windage: Rotate turret left 40 clicks.

3. Shoot another arrow to check adjustment. Repeat as necessary.

Sight In Method Using a Ruler

Step 1

Use an inch-based ruler to measure the distance your arrow misses the
bullseye. Set the magnification to 2.5x, then aim and shoot from a distance of
8 yards. Try to keep your eye centered behind the eyepiece in order to reduce
the effects of parallax at this very close range.

1. Measure the distance your arrow missed the bullseye in inches. Divide
your measurement by .08 to convert to MOAs. At 8 yards, one MOA equals
.08 inches and each turret click adjusts the point-of-impact .08 inches.
2. Rotate the turret to move the appropriate number of MOAs in the
direction you wish the arrow’s point-of-impact to move.

Step 2

Due to trajectory arc, the initial 8-yard zero will closely correspond to the
desired final 30-yard zero. Move the target back to 30 yards, adjust the scope
to a magnification of 5x and shoot another arrow at the bullseye. Be sure to
keep your eye centered behind the eyepiece.

Example

Looking through the scope, the arrow strike is 1 hashmark low and 1.5
hashmarks left of the bullseye. Important Note: Hashmarks as seen in the
reticle are marked in increments of 5 MOA, but at 5x these increments will
span 10 MOA.

1. Calculate amount of adjustment needed:
Elevation: 1 x 10 = 10 MOA
Windage: 1.5 x 10= 15 MOA

2. Adjust the turrets (each click equals 1
MOA):
Elevation: Rotate the turret up 10 clicks.
Windage: Rotate the turret right 15 clicks.

3. Shoot another arrow to check adjustment. Repeat as necessary.