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Ruger American Predator 6.5 Zero question

This is a discussion on Ruger American Predator 6.5 Zero question within the Ruger Bolt Action forums, part of the Rifle & Shotgun Forum category; I just brought a Ruger American Predator 6.5 and mounted a vortex Viper HS 4x16 with viper vortex low rings. When I mounted the scope ...


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Old March 22nd, 2017, 05:13 AM   #1
 
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Ruger American Predator 6.5 Zero question

I just brought a Ruger American Predator 6.5 and mounted a vortex Viper HS 4x16 with viper vortex low rings. When I mounted the scope and zeroed at 100 yards I had to make 10 MOA elevation adjustment from the scopes true zero to find rifle zero. So, now I only have only about 15 MOA left for elevation and I am maxed around 600 yards.

I was shooting this weekend and got sub 1 inch groups at 100 and maxed it out at 600 and was getting 6 in groups but now I don't have any more adjustments.

Is something wrong with my setup? or is this normal?



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Old March 22nd, 2017, 02:04 PM   #2
 
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You should get a 20 moa base. I did on mine. The amount of adjustment you need will also be dependent on the height of the rings you are using. I see you are using the low rings, so that's good, but I would get the new base for sure, if you are planning on reaching out to the 1000.

You can find the bases rather cheap on eBay if you shop around.
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Old March 23rd, 2017, 03:41 AM   #3
 
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You Indeed have an issue. Please tell us if you bothered centering the scope prior to shooting. What I mean by centering is that you run the elevation dial all the way down...then run it all the way up, counting the revolutions and clicks. Take that number and divide by 2....that will be your elevation center.
Now, run your windage all the way in....then Take that number and run your windage out to that. Now your scope is pretty much centered.

With a 6-5Creedmoor, take your first shot at 25yards. Mark the position and move your adjustments to match that point of impact. If you decide to use windage adjustable bases, it is at this point you adjust the base, leaving the scope's windage turret alone.

Fire one round at 100...note the impact point. Adjust via the turrets to match while counting the clicks. You either have 1/2" click or 1/4" click adjustment.

If you've followed the above steps correctly and you find you're having to adjust your turrets by a really large count, your scope is defective. Test this by trying another scope.

Lastly, its not the rifle. Its the the scope or the scope base. You can cut 4 square sheets of a cola can and shim the rear of the base, hand tighten using blue locktite. Each small square of aluminum cut from a cola can measures 0.0004"...

I highly doubt that the base is defective as they are a precision cast unit and the odds of the base being out of spec is highly unlikely. The scope is an assembled product and any number of things can go wrong during the assembly of a scope.

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Old March 23rd, 2017, 08:28 AM   #4
 
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I took the Leupold VX-3 4x14 off of my Sako TRG42 in 338 Lapua and put it on my RAP 6.5C. I only had 20 moa of elevation from a 200 yd zero so I had to get creative with the markings in the sight picture. I took a 5ft tall piece of cardboard and marked off each inch (moa) at 100 yds and then shot using each mark in the sight picture to see where it ended up (Boone and Crocket style reticle) Because I am a techno-tard, I WROTE the results on a card, laminated it and stuck it to the stock..... I had put a Hawke optic on my Lapua mag so I did the same thing with it. As an example on the Hawke, there are over 32 moa of elevation built right into the sight picture so I can do 300, 500, and 1000 yds without any clickin' or flickin'.... Once you pass the 1000 mark though, clicking and flicking are mandatory. I shoot with guys that have 20 and 40 moa ramps and get the more or less the same results (depending on coffee lol). IMHO there is no better way of getting to know your optics than shooting with them and playing around with all the doodads.
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Old March 23rd, 2017, 10:16 AM   #5
 
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Edit: the cola can shims are 0.004".....not able to edit earlier post-
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Old March 23rd, 2017, 08:32 PM   #6
 
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Your least expensive solution is to install a 20MOA scope base. Essentially you bought a scope with only 50MOA of travel. So yes.....true center is 25MOA minus the 10 it took you to zero......15 MOA left.

To make hits at 1000Y you need about 33MOA elevation....somewhere in there depending on your MV with that 22" barrel. So add on a 20MOA base and this will give you roughly 35MOA total elevation left.....in and around. Scopes vary as do the exact MOA taper on bases.

600Y should see you around 13MOA...again depending on MV. You said you were up to about max....15MOA.....so yes somewhere in there.

You have a nice rifle but I don't believe it was intended as a long range rifle, rather a hunting rifle, where perhaps most responsible shots would not be further than about 300-400Y with maybe varmint type stuff out to 600Y tops. You also do not have a long range optic. Optics for LR shooting should have between 60 and 100 MOA of internal adjustment and a 20MOA base to boot.

My advice to you, if you stay with this combination, is to install a 20MOA base if you can find one that fits your rifle and then shoot the rifle within its potential. You can certainly have fun trying for the super long hits and you may even do well out to 1000Y. Just don't expect too much out of the rifle and especially with that optic. Note about the picatinny base.....make sure the bottom of the base is a contour that matches your receiver. For example if you put it in place and just the edges are touching with a big air gap under the center.....that is not good. If you cannot find one that fits your rifle exactly, you may have to do some work to get the surfaces to mate properly. Or just try the coke can shimming as suggested by RugerLoyalist. Personally I would try to find a 20MOA base though. Just me.


BTW.....what is your optic.......4-16X50 or 4-16X44 and what reticle do you have? V-Plex or DeadHold?

You really want a reticle with sub tensions and the G2 type reticles are awesome for holding for wind.

I would have gone Viper PST Gen II 5-25X50 FFP MRAD with the EBRII reticle. But that is a $1300 scope. Or even a GenI PST 6-24X50 FFP with the EBR-1 MRAD reticle. A used Bushnell DMR 3-21X50 with the G2 reticle is a great optic also.


Also.....what ammo are you using? Any idea of the MV?
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Old March 23rd, 2017, 08:36 PM   #7
 
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I think this is you......

Ruger American Short Action Scope Mount 20 MOA: EGW Gun Parts
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Old March 24th, 2017, 05:58 AM   #8
 
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Guys,

Thanks for the info. I was shooting Federal American Eagle open tip match MV 2700. With a Viper vortex 4x16x44 with the deadhold reticle.

It is my first rifle and it will be primarily a deer hunting rifle for 300 yards and less. Which I definitely accomplished. But I am now interested in learning more about rifles and shooting and maxing out this setup.

for 40 bucks, Sounds like the 20 MOA bases are the way to go if I choose. I think I might shoot a few more time utilizing the deadhold reticle before I decide to add the new base. In theory I should be able get 800 yards with the reticle.
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