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Remove any mounts, rings, sunshades, or lens covers. It is recommended that you purchase insurance and retain a tracking number to document the arrival of your product. For an estimate on turnaround, please call our technical service department at Leupold or Attn: Product Service Dept. Yes, BDC dials are available for many Leupold scopes. When encountering an issue involving exhausted adjustment travel it is likely related to the alignment between the scope and barrel.
When producing a firearm, there are many different components, each having a tolerance specification. As these tolerances stack, the alignment between the receiver and the barrel changes; this is why 10 seemingly identical rifles will all require different amounts of scope adjustment to sight-in. This is also why some scopes will reach the end of the adjustment travel without properly aligning to the bore; running out of adjustment before you can place the bullet in the center of the target.
This issue can be rather frustrating to the average rifleman who simply wants to sight-in and leave the adjustments in a single position, but to the long-range shooter who makes adjustments more often, the issue is compounded. People often want to know how far can I shoot with a particular scope, meaning how much elevation adjustment they will have for long-range shooting.
This is not a question that can easily be answered because of the previously mention tolerance stack. Due to differing tolerances, rifle 1 requires MOA of down adjustment from the scope to be sighted in at yards and rifle 2 requires MOA of up adjustment.
This means that the scope on rifle 1 will have MOA of up adjustment remaining, allowing the shooter to make the proper correction for shots up to 1, yards; rifle 2 will have MOA of up adjustment remaining, allowing the shooter to make the proper correction for shots up to yards. Even though the rifles seem exactly the same, 2 will require a long range base or shims much sooner than rifle 1. Elevation issues can be resolved by shimming.
If more up adjustment is required, the rear of the base needs to be shimmed between the receiver and the base. If you need more down adjustment, the front base needs to be shimmed.
In making this adjustment it should be noted each 0. Shimming does not induce stress on the scope, but typically reduces stress by properly leveling the scope to be parallel with the receiver. If an issue exists on the windage axis, the correction needs to be made with windage adjustable bases or rings. Leupold offers windage adjustable bases STD which have two windage screws holding the rear ring. By loosening one side and tightening the other, they shift the rear of the scope right or left.
It should be noted that shifting the rear of the scope to the left will cause the point of impact to shift to the left and vise versa. It should also be noted that if one axis is near the limit of its adjustment, there will be a reduction in the amount of adjustment on the other axis. If the elevation adjustment is near the top of the adjustment range, the windage adjustment will be reduced; if windage adjustment has been induced, there will be a reduction in elevation adjustment.
This can be illustrated by drawing a circle on a piece of paper to represent the maintube of a scope. If you start in the center of the circle with your pencil, you can move an equal distance in any of the four directions: up, down, left, or right.
If you start in the center of the circle and move upwards toward the top of the circle, you will see that the distance remaining to the left and right has been diminished.
The same is true in any direction; if you start in the center of the circle and move to the left, you will have diminished travel to adjust up or down. When smaller parts are placed in the same size housing maintube , they will have the ability to move farther, but will also have negative aspects relating to image quality and durability. In the diagrams above, the outer circle represents the maintube of the scope when looking through the optic.
Unfortunately, we cannot refinish a scope. To effectively remove scratches, dings, or ring marks, the affected area must be replaced. In these instances the Leupold Custom Shop can replace the maintube or other external parts.
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