The mfg centers the scope reticle optically and mechanically before scope leaves the factory.
Not all mfg's scopes have the same amt of adjustment range (elev or windage), as this varies in brands and within same mfg's models.
If installing a used scope or a scope that has been previously installed on a different gun it is a good idea to check mechanical centering before you mount scope on a different gun.
One way you can do this is by counting the turns lock to lock on elev and windage screws. Turn either screw in until it comes to a stop (don't over torque) and then turn counter clockwise unscrewing, and at the same time count the no# of turns, and partial turns needed until you reach the opposite lock. Now divide this no# in half and turn adj screw back in this amt. Do this for both elev and windage.
This mechanically centers reticle in scope giving you equal adj range both directions, windage or elevation. This will help to prevent running out of adj from a non centered reticle when sighting in.
Variations in rifle receiver dimensions, mountings holes drilled out of alignment, or barrels screwed into receiver at an angle will cause initial scope mis-alignment.
If using a scope base with windage adj screws like the Leupod std base, you can make major bore sighting adjustments with mount adj screws and make final adjustment using scopes internal windage and elev screws. There is no acceptable way to increase elev except by shimming rear base or front base and would be used as a last rsort only if needed adj can't be reached with scopes internal adjustments.
The above info will help prevent running out of internal adj when final zeroing and especially when using a scope with limited adj range.
This is just a tip to remind us to check this often over looked part of the scope installation process.
Pocampo
Not all mfg's scopes have the same amt of adjustment range (elev or windage), as this varies in brands and within same mfg's models.
If installing a used scope or a scope that has been previously installed on a different gun it is a good idea to check mechanical centering before you mount scope on a different gun.
One way you can do this is by counting the turns lock to lock on elev and windage screws. Turn either screw in until it comes to a stop (don't over torque) and then turn counter clockwise unscrewing, and at the same time count the no# of turns, and partial turns needed until you reach the opposite lock. Now divide this no# in half and turn adj screw back in this amt. Do this for both elev and windage.
This mechanically centers reticle in scope giving you equal adj range both directions, windage or elevation. This will help to prevent running out of adj from a non centered reticle when sighting in.
Variations in rifle receiver dimensions, mountings holes drilled out of alignment, or barrels screwed into receiver at an angle will cause initial scope mis-alignment.
If using a scope base with windage adj screws like the Leupod std base, you can make major bore sighting adjustments with mount adj screws and make final adjustment using scopes internal windage and elev screws. There is no acceptable way to increase elev except by shimming rear base or front base and would be used as a last rsort only if needed adj can't be reached with scopes internal adjustments.
The above info will help prevent running out of internal adj when final zeroing and especially when using a scope with limited adj range.
This is just a tip to remind us to check this often over looked part of the scope installation process.
Pocampo
