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RPR (6.5 Creedmoor): Best Horizontal Reference Plane?

This is a discussion on RPR (6.5 Creedmoor): Best Horizontal Reference Plane? within the Ruger Bolt Action forums, part of the Rifle & Shotgun Forum category; Hi, all! Before I start sighting in my RPR 6.5 Creedmoor, I want to get the scope aligned properly with the rifle. What horizontal plane ...


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Old November 21st, 2019, 03:43 PM   #1
 
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RPR (6.5 Creedmoor): Best Horizontal Reference Plane?

Hi, all!

Before I start sighting in my RPR 6.5 Creedmoor, I want to get the scope aligned properly with the rifle. What horizontal plane on the rifle have you guys been using as a reference?

My level shows that the Picatinny rail and the flat receiver surface just behind it are not exactly parallel. The area of the forestock (hand guard) just in front of the rail is very close to, but not exactly, parallel with the rail. So I'm seeing several horizontal planes that look useful but they're not parallel!

What do you suggest?

Thanks!
--Tom



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Old November 21st, 2019, 03:52 PM   #2
 
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The pic rail is a 20MOA rail..........mount your scope on it, adjust your cheek piece to fit your personal positioning and zero it in. Sorry if it was a short answer but your question has me a little confused.
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Old November 21st, 2019, 04:05 PM   #3
 
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Mark204, I get that and for short ranges it's not that important. But I'll be reaching out a little farther.

I'm trying to ensure that the scope reticles are on the same plane as the rifle receiver. (Extreme worst scenario: you mount the scope 45 degrees off horizontal, so your up/down sighting adjustments aren't going up and down, but at a 45 degree angle. Even small variances between scope reticle and receiver reference positions make sighting in at long distance much more challenging.)

I tried eyeballing the scope position but it's obvious that I'm several degrees off. The standard procedure is to find a horizontal reference point on the firearm receiver and position the scope (before tightening the scope mounts) to achieve the same horizontal position.

So my question is, given that I have several horizontal planes on the rifle but they are not parallel with each other, which is presumed to be the most relevant?

Thanks,
--Tom
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Old November 21st, 2019, 04:16 PM   #4
 
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Ok, now I get it.....................use the rail.
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Old November 21st, 2019, 04:18 PM   #5
 
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Thanks.
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Old November 21st, 2019, 05:54 PM   #6
 
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Quote:
Originally Posted by Mark204 View Post
Ok, now I get it.....................use the rail.
+1 Place a level transversely across the rail and clamp the rifle so the bubble is centered. Then adjust the scope so the horizontal cross hair is level using a known level line such as a window sill (assuming your house was build square ) or a long carpenter level set level at some distance from the rifle.
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Old November 22nd, 2019, 12:57 PM   #7
 
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I have the Wheeler dual level kit. One of them goes into the receiver with the bolt in the back position. The other one goes on your elevation turret.
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Old November 23rd, 2019, 01:09 PM   #8
 
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You also have the option of leveling the optic in the rings on a fixture. Many of us have given up the irregularity of leveling the rings on various rifle features, installing our anti-cant devices (scope levels) and testing vertical tracking alignment (tall target tests) with leveling fixtures. The weighted fixtures aren't cheap, but well worth the cost if you're installing optics on precision rifles very frequently.
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Old November 25th, 2019, 09:13 AM   #9
 
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Thanks, all.

I picked up a Wheeler dual-level kit (nice kit, BTW!) and used the top of the rail as the reference plane.

All good now.

--Tom
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