Windage screws on Leupold 2-piece base?

[boomer49]

Hi guys,

I just bought a set of used (but mint) Leupold 2-piece bases and rings for my new .223 SPS Varmint.

Quick question ... how does the windage adjustment on the rear base work? I assume that I should use that feature when I do my first sighting-in tomorrow ... rather than using the scope's L-R adjustment.

There's a slotted screw head on each side (left and right) of the base ... I'm wondering why. Are they attached to a common shaft or something? Also, I think that those screws also secure the ring to the base ... maybe that's their primary (or only) purpose.

A quick tutorial would be mucho appreciated.

Thank you.

Boomer

 

[Grizzlypeg]

Unscrew them and you will see that each is a separate screw. Centre your scope windage adjustments then bore sight it or get is close using the two screws. They need only be just tightened down while adjusting. Once the scope is pretty close to centred, tighten them to 60 inch-lbs and leave them. Use the scope's windage adjustment after that.

 

[cs1973]

Boomer,those windage screws are there to adjust for just that - to adjust for windage on initial sightin. I use this feature to adjust while keeping the scope's windage in optic center (exact center of max L-R 'click' adjustment). some older rifles(and some newer ones as well) commonly had the scope base mounting screw holes drilled and tapped intothe reciever somewhat out of center alignment with the barrel, thus the scope was not in optic center once mounted and sighted in with a fixed type base. for example, An older winchester M70 I had was as such. with a weaver/picantinni base on said rifle, my scopes were always 32 clicks off to the right adjustment at 100yards. with the Leupold base I was able to center the scopes and accuracy was much better from each scope I tried.

 

[Grizzlypeg]

Here's a quote from the instructions:

With STD bases, make initial windage adjustments during bore-sighting by turning the large screws at the rear of the base. (Avoid over-tightening these screws.) Use the scope's internal adjustments to make final sighting-in adjustments.

That's all she wrote.

 

[boomer49]

Back and forth?

Thanks guys.

I'm trying to imagine how this works. If they both "push" on the ring within the base, should one be loosened while the other one is tightened? Like ... if I wanted to move the POI to the right, would I relax the RH screw and snug-down the LH screw sort-of simultaneously?

 

[fratri]

Thanks guys.

I'm trying to imagine how this works. If they both "push" on the ring within the base, should one be loosened while the other one is tightened? Like ... if I wanted to move the POI to the right, would I relax the RH screw and snug-down the LH screw sort-of simultaneously?

I am no expert, but yes that's how I believe it works.... I just did mine that way on the weekend. I turned my screws in all the way and out equal amount of times and the mounted the scope and tightened them equal amounts, thinking that it should keep it centered, I did not have a bore sighter but I was right or lucky because my first shot at 25 yds was dead center and 2"'s high...