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Scope almost out of adjustment?

 
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  #1  
Old 04-29-2013, 09:35 PM
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Join Date: Sep 2011
Posts: 40
Scope almost out of adjustment?

I've mounted my Vortex PST on my Cooper using Talley Lightwieght one-piece rings. The problem is I only have about 20 moa left to dial up on the elevation turret. I'd like more.

Is there anything that can be done other than shimming the rear ring? I thought I red somewhere that Talley can machine them to improve this. I plan to call them tomorrow. Until then, any suggestions or experiences are welcome.

Thanks
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  #2  
Old 05-01-2013, 04:26 PM
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Join Date: Sep 2010
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Re: Scope almost out of adjustment?

If you put a 20moa picatinny rail on it that will get you to 40moa of travel, if you can find a 30 moa rail that will get you to 50moa of travel
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  #3  
Old 05-01-2013, 05:02 PM
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Location: Near Napoleon,MI
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Re: Scope almost out of adjustment?

A Viper PST is a 75MOA elevation scope. So if you put a "flat" base on it, you theoretically have 37.5 MOA in the "up" direction. If you use a 30MOA tilted rail on it, that would allow 37.5+30 = 67.5MOA of "up" travel. If you absolutely have to get the most travel possible out of the scope then that is what it would take.

The downside of course is that one is not looking through the center of the optical system at either close range or at maximum range, but on the other hand, this is what these scopes are designed for.

I'm a little curious how you only end up with 20MOA of travel after zeroing ? "Using" 17.5MOA to zero a scope indicates that something is wrong. Are you sure that you don't have a 20MOA rail and have it on backwards ? That way you "used" 3MOA to zero it after an initial 20MOA correction (the wrong way). I would check if it is possible that the rail could be reversed.

OK, checked what it is that you have and the base is integrated into the ring. Is the front and back ring the same ? Very little info on the Talley website, but they say nothing about the one piece rings being inclined.
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  #4  
Old 05-01-2013, 09:20 PM
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Join Date: Sep 2011
Posts: 40
Re: Scope almost out of adjustment?

Quote:
Originally Posted by westcliffe01 View Post
A Viper PST is a 75MOA elevation scope. So if you put a "flat" base on it, you theoretically have 37.5 MOA in the "up" direction. If you use a 30MOA tilted rail on it, that would allow 37.5+30 = 67.5MOA of "up" travel. If you absolutely have to get the most travel possible out of the scope then that is what it would take.

The downside of course is that one is not looking through the center of the optical system at either close range or at maximum range, but on the other hand, this is what these scopes are designed for.

I'm a little curious how you only end up with 20MOA of travel after zeroing ? "Using" 17.5MOA to zero a scope indicates that something is wrong. Are you sure that you don't have a 20MOA rail and have it on backwards ? That way you "used" 3MOA to zero it after an initial 20MOA correction (the wrong way). I would check if it is possible that the rail could be reversed.

OK, checked what it is that you have and the base is integrated into the ring. Is the front and back ring the same ? Very little info on the Talley website, but they say nothing about the one piece rings being inclined.
No rail on this installation. The Talley's I used are the base/ring combination. The screw spacing from the front to back are different, so a swap was out. I did contact Talley and they verified that I received the correct set of rings. They're sending me a new set out to try to see if that solves the problem. If it doesn't i guess that points to the optic, or possible the receiver. Kudos to Talley, great CS.
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  #5  
Old 05-01-2013, 09:51 PM
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Location: Near Napoleon,MI
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Re: Scope almost out of adjustment?

Are you specifically trying to save every ounce of weight ? Using a one piece rail that is inclined at 20MOA and "conventional" rings gives you a lot more flexibility in setting up a scope. The only time I have used a 2 piece base is on my slug gun where ejecting a 20ga shell needs all the clearance it can get.

Most scopes I have set up have not needed more than 3MOA (12 clicks) of correction.
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  #6  
Old 05-01-2013, 10:30 PM
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Join Date: Sep 2011
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Re: Scope almost out of adjustment?

I hear what you are saying in regards to weight and the amount you have dialed. The guys at Talley agreed that the scope should have more "dial up". I did consider a Ken Farrell rail. I'll see if the new rings make any difference.

I'll keep you posted and thanks to those of you with input.
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  #7  
Old 05-01-2013, 10:38 PM
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Join Date: Jan 2013
Location: Maple Valley, Washington
Posts: 458
Re: Scope almost out of adjustment?

You can get 20 MOA out of a set of Burrins signature Zee rings using the - 10 and +10 inserts under the scope front and back respectively. Graf's sells these for around $43. They come in three heights.
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