Vortex Optics VIPER PST 1-4X24 RIFLESCOPE - Manual (Page 9)

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.
Setting the CRS Stop and Indexing Elevation Knob
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.
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RIFLESCOPE
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.
Note: Be sure the reticle is in focus (see Reticle Focus section on page 6).
This procedure can be repeated as many times as necessary to achieve a
perfect zero.
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 bullseye.