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

Page 11

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Think of arrow drop in MOAs, not inches.

The first step to successful long range crossbow shooting using the XBR
is to learn to think of arrow drops in MOAs (not inches). This has the
tremendous advantage of allowing you to easily and rapidly adjust the scope
using either the MOA marks on the elevation turret or the MOA marks on
the vertical crosshair.

Build a Drop Chart in MOAs.

After establishing a 30-yard zero, the second step is to build an MOA
drop chart for your specific crossbow and arrow combination at increasing
distances of 30, 40, 50, 60, 70 yards, etc.

1. Begin by choosing the sample chart and arrow speed that most closely
matches your crossbow (see samples below and on page 22).
2. Dial up the suggested adjustment for the distance you are shooting.
3. Shoot at your target and measure how much the arrow hit above or
below the bullseye in inches.
4. Calculate the MOAs by dividing your measurements by the value
listed in the conversion chart on page 20 and adjust turrets accordingly.

• If arrow strikes low, add your calculated MOA value to chart value.

• If arrow strikes high, subtract your calculated MOA value from chart
value.

5. Shoot again. When you hit the bullseye, record this final MOA
adjustment for future use.

MOA markings on XBR-1 reticle.

Example

If your arrow has dropped 12
inches on a 50-yard shot, it has
dropped 24 MOA.

12 ÷ .5 = 24 MOA

Conversion Chart

Use the following values when
converting from inches to MOAs.

1 MOA =

1.0 inch at 100 yards

.9 inches at 90 yards

.8 inches at 80 yards

.7 inches at 70 yards

.6 inches at 60 yards

.5 inches at 50 yards

.4 inches at 40 yards

.3 inches at 30 yards

.2 inches at 20 yards

MOA markings on the XBR turret.

Sample
Drop Charts

Drop Chart in MOAs

325 fps

Adjustments

30 yards

40 yards

15 MOA

50 yards

30 MOA

60 yards

46 MOA

70 yards

63 MOA

Drop Chart in MOAs

360 fps

Adjustments

30 yards

40 yards

12 MOA

50 yards

26 MOA

60 yards

41 MOA

70 yards

55 MOA

80 yards

71 MOA