Vortex Optics VIPER 2-7X32 - VERSA-PLEX C3 - Manual (Page 6)

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Visually bore-sighting a rifle.
Bore Sighting
Initial bore sighting of the rifle and scope will save you money and
time at the range. This initial sighting can be done in a number
of ways. You may want to use a mechanical or laser bore sighter
according to the manufacturer’s instructions. On some rifles, bore
sighting can be done visually by removing the bolt and sighting
through the barrel.
To visually bore sight a rifle:
1. Place the rifle solidly on a rest and remove the bolt.
2. Sight through the bore at a target approximately 100 yards away.
3. Move the rifle and rest until the target is visually centered inside
the barrel.
4. With the target centered in the bore, make windage and
elevation adjustments until the reticle crosshair is also centered
over the target.
Final Range Sight-In
After you have bore sighted your rifle and scope, you should go to
the range and do a final sight-in using the exact ammunition you
expect to use while shooting. Sight in and zero your 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.
1. Be sure the reticle is in focus (see Reticle Focus on page 5) and
set the side focus adjustment (if present) to match the distance
being used for sight-in.
2. Following all safe shooting practices, fire a three-shot group as
precisely as possible.
3. If the shot group is not centered on the bullseye, adjust the
point-of-aim using the windage and elevation turrets (see Windage
and Elevation Adjustment on page 6).
TIP: 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.
4. Carefully fire another three-shot group and see if the bullet
group is centered on the bullseye. If the bullet group is not
centered, repeat Step 3.
This procedure can be repeated as many times as necessary to achieve
a perfect zero.