T he V ortex ® V iper ® XBR ™ C rossbow S cope The Vortex®Viper®XBR™ crossbow scope is intended for extended range crossbow shooting. With the XBR, you have the unique ability to choose between using the elevation turret or the reticle when compensating for arrow drop on long shots. Fast Focus Eyepiece Illumination Adjustment Dial MagView Elevation Adjustment Dial Reticle Focus Magnification Adjustment Ring Windage Adjustment Dial Objective Lens — Please read entire manual before using your new optic.
R eticle O ptions C rossbow S cope A djustments The Focal Plane Reticle Focus All scope reticles can be termed either first focal plane (FFP) or second focal plane (SFP) according to the internal location of the reticle within the scope. This model features a second focal plane reticle design. The Viper XBR crossbow scope features a fast focus eyepiece designed to quickly and easily adjust the reticle focus.
Windage and Elevation Adjustments MOA Adjustments The Viper XBR scope features precision finger-adjustable elevation and windage dials with audible clicks. The Viper XBR crossbow scope uses finger adjustable elevation and windage turrets with scales measured in minutes of angle (MOA). MOAs are a unit of angular measurement which approximately equals one inch at 100 yards. Elevation Dial To make adjustments: 1.
Turret Rotation Variable Power Adjustments Vortex’s patented Radius Bar visually assists keeping track of turret rotations and provides a quick visual reference that allows you to confirm: Radius Bar To change the magnification, turn the magnification ring to the desired level. The MagView fiber optic magnification indicator provides a low light reference for magnification level. A small tactile indent at the 5x magnification setting allows you to quickly select 5x.
Customizable Rotational Stop (CRS) Focus and Parallax The elevation turret on the Viper XBR crossbow scope features the unique CRS rotation stop. After sighting in the crossbow, the CRS allows you to quickly and easily return to an original zero point after dialing in arrow drop corrections. Parallax is a phenomenon that results when the target image does not quite fall on the same optical plane as the reticle within the scope.
C rossbow S cope M ounting Eye Relief and Reticle Alignment The XBR scope requires 30 mm mounting rings of a medium or high height. Most modern crossbows have a pre-installed Weaver base, so your ring choice should be compatible with this type of base. Install the bottom ring halves on the mounting base. Place the crossbow scope on the bottom ring halves and loosely install the upper ring halves.
S ighting in the XBR C rossbow S cope Step 2 between 8 and 30 yards will be just slightly high and may be compensated for 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. by holding point of aim on the first reticle tick above center.
Example Setting the CRS Stop and Indexing Elevation Dial The arrow strike is 2 inches high and 4 inches to the right of center. After obtaining a satisfactory zero, the CRS stop can be set using the following technique: 1. Calculate amount of adjustment needed: Elevation: 2 ÷ .08 = 25 MOA Windage: 4 ÷ .08 = 50 MOA 1. Loosen the three turret cap retaining screws on the elevation turret and gently pull the turret cap straight up and off of the turret post. Be careful not to rotate the turret post. 2.
Using the CRS Zero Stop Indexing the Windage Dial with Zero Reset Now that you have installed the CRS shims, you can rotate the elevation dial clockwise and easily return to the original zero point after making a temporary elevation adjustment. The dial will stop turning just past the original zero. The Viper XBR scope features a windage dial that will allow you to re-index the zero indicator after sight-in without disturbing your settings.
H ow to S hoot at L ong R ange with the Think of arrow drop in MOAs, not inches. XBR 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. Conversion Chart Use the following values when converting from inches to MOAs.
Drop Chart in MOAs Sample Drop Charts Drop Chart in MOAs 385 fps Adjustments 425 fps Adjustments 30 yards 0 30 yards 0 40 yards 11 MOA 40 yards 7 MOA 50 yards 23 MOA 50 yards 16 MOA 60 yards 36 MOA 60 yards 26 MOA 70 yards 49 MOA 70 yards 37 MOA 80 yards 63 MOA 80 yards 48 MOA 90 yards 77 MOA 90 yards 59 MOA 100 yards 92 MOA 100 yards 71 MOA Example Using a 360 fps Crossbow at a 40-Yard Distance Shooting with the initial adjustment as suggested in the sample drop chart
Arrow Drop Correction Using the Elevation Turret Using the elevation turret to adjust for arrow drop is slightly slower than using the reticle, and also entails some hand motion which could spook game. The advantage to making a turret adjustment is that it is not sensitive to the scope’s magnification and can be successfully used at any magnification. Simply turn the turret in the up direction the number of MOAs indicated on your drop chart, then shoot using the center crosshair.
T he VIP W arranty We build optics based on our commitment to your absolute satisfaction. That’s why Vortex products are unconditionally guaranteed and we make this Very Important Promise to you—a Very Important Person. Rest assured that in the event your Viper XBR scope becomes damaged or defective, Vortex Optics will repair or replace the scope at no charge to you. If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition.
