Leupold Windage Adjustable Scope Bases

[JRock95]

I have a Winchester Model 70 with slightly misaligned scope base screws in the receiver. Outside of having a gunsmith fix this, most people seem to recommend an adjustable windage base such as the Leupold bases like this one. I'm curious though, fixing the misalignment with a base like this likely puts a lot of torque/stress on the scope tube, no? I understand how the front ring can be angled to align with the barrel, but the rear adjustment can only shift left/right perpendicular to the receiver. Wouldn't that mean the front and rear rings would not be perpendicular to eachother? ( I would think they can only be aligned if the rear ring had an adjustment angle of a slight arc, rather than just left right on a straight line).

 

[B Harrison]

I have a Winchester Model 70 with slightly misaligned scope base screws in the receiver. Outside of having a gunsmith fix this, most people seem to recommend an adjustable windage base such as the Leupold bases like this one. I'm curious though, fixing the misalignment with a base like this likely puts a lot of torque/stress on the scope tube, no? I understand how the front ring can be angled to align with the barrel, but the rear adjustment can only shift left/right perpendicular to the receiver. Wouldn't that mean the front and rear rings would not be perpendicular to eachother? ( I would think they can only be aligned if the rear ring had an adjustment angle of a slight arc, rather than just left right on a straight line).

I just had to use this on mine for the first time to get lined up (chose to)

The rings, if aligned, would need to be re-aligned or lapped to correct for the adjustment, but I’m not sure how to tell you if it’s needed…..
Mine was 24” off at 25 yards, it came out with about 1 turn of the screws.


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[Fred@Exterra]

No, they don’t put any appreciable mis-alignment on the tube. The front mount acts as a pivot and the rear adjusts from left to right around that pivot. There is a slight amount of torque at the furthest extents of the travel because the adjustment screws are no longer perpendicular to the bore of the scope, but this is minimal.

I used these a bunch back in the nineties because I had several misfit Remington 700s… people would sell them cheap… anymore I’d just open the holes up to 8-40 with a carbide endmil

Just make sure you adjust your scope to the center of the travel before you mount it, then bore-sight it using the mount screws to get your course windage. This should fix your problem.

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