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Missing elevation adjustment on a Savage 12LRP

 
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  #1  
Old 03-05-2013, 10:26 PM
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Join Date: Apr 2012
Location: SoCal
Posts: 44
Missing elevation adjustment on a Savage 12LRP

Hi there,

I put a Vortex PST 6-24X on my Savage 12 LRP in 260 REM. My setup is Weaver 20 MOA rail and Burris Signature Zee rings. Using the plastic insert, the rings provide 17 MOA. Together they should provide 37MOA, or 10.7 MIL of elevation gain. My sample of PST 6-24 has 20MIL of elevation adjustment. I thought I would have close to 20MIL of elevation adjustment.

To my dismay, the scope only has 9 MIL of elevation adjustment after sighting in at 100 yard. In other words, 11 MIL was missing! I checked the plastic insert twice to make sure I have the correct setup: -10 on bottom of front ring and +10 on top, +10 on bottom of rear ring and -10 on top. I also measured the Weaver rail with caliper and it is 20 MOA. Similar rail and ring setup on my 111LRH provided 6 MIL of elevation gain, missing 4 MIL. I can live with missing 4 MIL, but 11 MIL are too much.

Is this a problem with gun? Perhaps massive barrel drooping, or receiver top is out of spec?

I am pretty sure I want to stay with Burris Sig Zee rings. Should I try another rail say Warne 20 MOA?

Thanks for your input.

Kevin

Last edited by freeflight; 03-05-2013 at 11:49 PM. Reason: typo
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  #2  
Old 03-06-2013, 11:09 PM
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Join Date: Jan 2013
Location: Maple Valley, Washington
Posts: 458
Re: Missing elevation adjustment on a Savage 12LRP

freeflight

If I understand, you are saying that with the rail and Signature rings you were biasing your scope so you had very little down adjustment left and almost the whole range of up adjustment which of course would let you shoot as far as the scope can shoot but for some reason you ended up in the middle of the scopes range almost as if you had used no rail or inserts.

If so, that is strange indeed. I have the Warne 20 MOA rail and Signature rings on the same rifle and it all worked as it should for me. If you have measured your rail changing to the Warne isn't going to fix anything and I doubt the rifle is to blame. Is the scope known good?
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Old 03-06-2013, 11:20 PM
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Join Date: Jan 2013
Location: Maple Valley, Washington
Posts: 458
Re: Missing elevation adjustment on a Savage 12LRP

freeflight

I just had one other thought. This is probably not the issue but since you use the Signature rings, Iíll mention it. Iíve noticed that a scope under recoil can slide in the plastic inserts on the Signature rings. I solved that problem by putting a piece of double stick golf club grip tape on the top of the scope under the plastic inserts. I love the Signature rings and have them on everything but you have to use the tape.
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  #4  
Old 03-06-2013, 11:50 PM
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Join Date: Apr 2012
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Re: Missing elevation adjustment on a Savage 12LRP

Hi Engineering101,
You understand me correctly. I was counting on the elevation gain of 20 MOA rail and Sig Zee insert to shoot as far as I can. But still ended up in the middle of the scope.
The scope is supposed to be good, no tracking issue. I had it on my AR with a 20MOA raiser, and gain about 5 MIL.

I can only measure the thickness along the edge of the rail and calculate the cant. My guess is either the rail is out of spec, or the barrel wasn't installed squarely on the receiver (barrel drooping).

I hope receiver top isn't out of spec. Main reason I bought the 12LRP is to reuse that Savage target action.

Kevin
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  #5  
Old 03-06-2013, 11:54 PM
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Join Date: Apr 2012
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Posts: 44
Re: Missing elevation adjustment on a Savage 12LRP

My experience with Sig Zee plastic inserts has been positive. I always remove oil from the inserts and rings before install them. I have them on my heavy barrel 308 (total weight 12 lb), and 7mm Rem Mag with a muzzle brake. Neither had any issue of scope sliding under recoil.
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  #6  
Old 03-06-2013, 11:58 PM
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Join Date: Jan 2013
Location: Maple Valley, Washington
Posts: 458
Re: Missing elevation adjustment on a Savage 12LRP

freeflight

If you take the rail off and put some generic steel bases on the rifle and put the zero inserts back in the Signature rings you should find out if the problem is the rifle or the stuff you are putting on it.

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  #7  
Old 03-07-2013, 12:07 AM
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Join Date: Apr 2012
Location: SoCal
Posts: 44
Re: Missing elevation adjustment on a Savage 12LRP

Hi Engineering101,

I am going to try a Warne 20 MOA rail and/or Burris Extreme rings to dissect the problem.

If it is a problem with the rifle, I wonder how Savage handle this kind of problem. The gun shoots great, 5 shots of NCC 140gr groups around 0.5MOA. Still working on a load for Amax 140gr.

Kevin
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