Vortex Optics RAZOR HD 1-4X24 (MOA) - EBR-556 MOA - Manual (Page 13)

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Bore Sighting
Initial bore sighting of the riflescope will save time and
money at the range. This can be done using a mechanical
or laser bore sighter according to the manufacturer’s
instructions. On some rifles, bore sighting can be
accomplished by removing the bolt and visually sighting
through the barrel.
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 you can visually center the
target 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.
To visually bore sight a rifle:
Note: If you are using rings which permit windage adjustments, make
your initial bore sighting windage adjustments with the rings as much
as possible.
Sighting in the Rifle