Vortex Optics VIPER PST 2.5-10X44 RIFLESCOPE User Manual
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RIFLESCOPE
Setting the CRS Stop and Indexing Elevation Knob
After obtaining a satisfactory zero, the CRS stop can be set if desired:
1. Loosen the three turret cap retaining screws on the elevation turret.
Gently pull the turret cap straight up and off of the turret post, being
careful not to rotate the turret post.
2. Slide the CRS shims on the center section of the turret post below
the V-grooved part.
Alternate shim installation direction
with each shim.
Place CRS shims
in this groove.
Use as many shims as necessary to
completely fill up the space. Do not
try to force in a last shim once the
clearance is very close—a tiny remaining
gap is normal.
Final Range Sight-In and CRS Stop Set
After the riflescope has been bore-sighted, final sight-in and CRS stop
set should be done at the range using the exact ammunition expected to
be used while shooting. Sight in and zero the riflescope at the preferred
distance. 100 yards is the most common zero distance, although a 200
yard zero may be preferred for long range applications.
Be sure the reticle is in focus (see Reticle Focus section on page 6) and
adjust the side focus knob if present until the target image is sharp and
without parallax error (see Using the Side Focus section on page 8).
1. Following all safe shooting practices, fire a three-shot group as
precisely as possible.
2. Next, adjust the reticle to match the approximate center of the shot
group (see Windage and Elevation Adjustment section on page 7).
Note: If the rifle is very solidly mounted and cannot be moved, simply
look through the scope and adjust the reticle until it is centered on the
fired group.
3. Carefully fire another three-shot group and see if the bullet group is
centered on the bulls eye.
This procedure can be repeated as many times as necessary to achieve a
perfect zero.