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# Dumb Question MOA Adjustment

#1
11-11-2011, 06:34 PM
 Bronze Member Join Date: Oct 2011 Posts: 71
Dumb Question MOA Adjustment

Okay, so I'm thinking of getting a Leupold VX-II 6-18x40.
It has 56 MOA of elevation, which means 28 up/28 down.
I currently have a Nightfoce 20 MOA rail on my gun, so
does this mean it will give me 10 up/10 down as well? Or
20 up?

I ask this because if it is only 10 up this will put me at 38
MOA adjustment up for elevation, and I am looking for a
little more.

Best Regards,

Hunter
#2
11-11-2011, 07:24 PM
 Gold Member Join Date: Aug 2009 Location: On the road again Posts: 511
Re: Dumb Question MOA Adjustment

You'll have 48 up/8 down, if you compare to the same point on a 0 moa rail.
#3
11-11-2011, 07:28 PM
 Bronze Member Join Date: Oct 2011 Posts: 71
Re: Dumb Question MOA Adjustment

Quote:
 Originally Posted by NomadPilot You'll have 48 up/8 down, if you compare to the same point on a 0 moa rail.
Thank you. Care to explain anyone?
#4
11-11-2011, 07:50 PM
 Gold Member Join Date: Aug 2009 Location: On the road again Posts: 511
Re: Dumb Question MOA Adjustment

With your 20 MOA base, you'll have the same "zero line," but that line will be 20 MOA off what it would be with a 0 MOA base. Your zero will shift 20 MOA. So, that gives you 20 MOA more of travel in that direction (back towards mechanical zero), at the cost of travel in the other direction (away from mechanical zero).

Top picture shows no cant. Zero line bisects the scope travel.

Bottom picture shows "20 MOA" cant. Zero line is offset to the top of the triangle, so you have an extra 20 MOA of travel on the large side.

Last edited by NomadPilot; 11-11-2011 at 07:56 PM..
#5
11-11-2011, 08:41 PM
 Bronze Member Join Date: Oct 2011 Posts: 71
Re: Dumb Question MOA Adjustment

Quote:
 Originally Posted by NomadPilot With your 20 MOA base, you'll have the same "zero line," but that line will be 20 MOA off what it would be with a 0 MOA base. Your zero will shift 20 MOA. So, that gives you 20 MOA more of travel in that direction (back towards mechanical zero), at the cost of travel in the other direction (away from mechanical zero). Top picture shows no cant. Zero line bisects the scope travel. Bottom picture shows "20 MOA" cant. Zero line is offset to the top of the triangle, so you have an extra 20 MOA of travel on the large side.
That was very informative, thank you!
#6
11-12-2011, 09:32 PM
 Bronze Member Join Date: Jul 2005 Posts: 63
Re: Dumb Question MOA Adjustment

Just to complicate things a little...

In the real world, you will likely not actually end up with a total of 48 MOA elevation available.

That's because it's normal to use up some elevation when sighting the rifle in. This can vary from rifle to rifle, but sighting in can easily use up 10 MOA or more.

If that's the case you may well end up with only 38 MOA UP available.

While that is a usable number., you could go to a 25 or 30 MOA base and gain elevation back, but you might want to look at some other scopes before you make your final decision. I'm not sure that particular scope is the best choice even in Leupold's line up.

TC

Last edited by Top Cat; 11-12-2011 at 09:54 PM..
#7
11-12-2011, 11:19 PM
 Silver Member Join Date: Feb 2010 Location: Smalltown, Virginia Posts: 358
Re: Dumb Question MOA Adjustment

Just to mix it up...

What if you were to get the 20MOA base... AND the Burris signature rings with the MOA offset inserts that could grant you up to 30 MORE MOA if you buy the kit for like 14 bucks... But thats just an idea.. your scope is going to be tilted something serious!
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