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Vortex Viper 6.5-20x50 & 300 WM problem

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Old 03-11-2012, 11:28 PM
Junior Member
Join Date: Feb 2012
Posts: 15
Vortex Viper 6.5-20x50 & 300 WM problem

I thought I had everything all figured out, then went out to sight in and now have a problem. I have a Win Laredo 300 WM and put a Viper 6.5-20x50 on it with a 20 MOA base ( mounted with thick end to the rear ) and Warne Maxima 30mm rings. When I sighted it in at 100 yds, I only have 6.75 MOA left to go up. Something has got to be wrong somewhere. I figured with the 20 MOA base, the Viper has 65 MOA of adjustment, I would have plenty of adjustment for the approx 25 MOA I thought I would need for 1000 yards. I assumed the 100 yard zero would be almost at the very low ( down ) part of the adjustment, but it took quite a bit of up to get it on at 100, leaving me not much left. I am very new to this, am I missing something? What is it gonna take to get this set up ready for long distance? Thanks in advance for any suggestions/telling me where I screwed up.
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Old 03-12-2012, 04:21 AM
Bronze Member
Join Date: Nov 2011
Location: Slovenia
Posts: 99
Re: Vortex Viper 6.5-20x50 & 300 WM problem

Have you tried if your target turns 65 moa without sighting? Maybe it is a manufacturing problem...
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Old 03-12-2012, 07:52 AM
Silver Member
Join Date: Jul 2011
Location: N.E.Ohio
Posts: 186
Re: Vortex Viper 6.5-20x50 & 300 WM problem

Shouldn't the thicker end be at front of reciever? This would raise the the scope plane from the bore. Hence you would lower the elevation turret to match the plane of the bore for sight in. This should take you into the negative of elevation MOA giving you them clicks now for plus MOA? I don't have +moa base but I think this how it works. Maybe someone else with more knowledge about canted bases will see post and chime in.

Gene R.
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Old 03-12-2012, 08:29 AM
Gold Member
Join Date: Jan 2008
Location: NW Montana
Posts: 814
Re: Vortex Viper 6.5-20x50 & 300 WM problem

The thicker part of the base is at the rear of the action. This causes your bore to point higher giving you more adjustment at long range.
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Old 03-12-2012, 09:19 AM
Platinum Member
Join Date: Feb 2007
Location: Townsend, Montana.
Posts: 7,764
Re: Vortex Viper 6.5-20x50 & 300 WM problem

Turn your elevation turret from one end of the travel to the other counting the total moa of travel. To make surethe scope does travekl through it's entire range.

Also with a 20 moa base the scope should be mounted with a slight downward slant towards the muzzle of the rifle and this should be visable.

It could be that this is an improper base for your recever, maybe mispackaged or something. Or I have seen EGW rails be off by as much as 30 moa. What brand rail is it?

It sounds to me that you have done everything correctly. I have that same scope on a rifle (AR 15 flat top) and it works great and I dal it to past 700 with no canted rail. So we need to find what is off here with the mounting.

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Old 03-12-2012, 09:42 AM
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Join Date: May 2011
Location: Ventura CA
Posts: 793
Yup, sounds like a problem with the barrel/receiver/mount. A misalignment problem of that magnitude should be easy to diagnose. Check the adjustment range on the scope, and confirm that the scope is ok.

Then I recommend you remove the rings so that you can inspect the mount. Place a 24" straight edge (steel ruler) along the top of the rail. Inspect the top surface to make sure the rail isn't bent. Inspect the alignment of the mount with respect to the receiver and the barrel. Then remove the mount and do the same for the receiver and barrel alone.

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Old 03-12-2012, 11:12 AM
Junior Member
Join Date: Feb 2012
Posts: 15
Re: Vortex Viper 6.5-20x50 & 300 WM problem

Thanks for your replies.
I checked the full travel of the adjustment on the scope and from bottom to top it does 5 full revolutions plus 3.5 MOA, so with 12 MOA per turn, I believe that shows 63.5 MOA of travel. The 20 MOA base is a Weaver, here is a photo of the set up. Just looking at it, there appears to be no bend or malformation. I will pull it off and check with a straight edge. Anyone see anything off just by eyeballing it?
Attached Thumbnails - Click to View Larger
Vortex Viper 6.5-20x50 & 300 WM problem-2012-03-12_10-00-15_122.jpg  
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