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Thread: 20 MOA base install
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June 6th, 2017, 03:26 PM #1Super Member
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20 MOA base install
Real quick guys I'm looking for some reassurance before the locktite goes on. I'm putting a nightforce 1 piece 20moa base on my Savage 308. The higher end goes on the rear correct?
There is zero instructions and the hole spacing is the same front and rear.Last edited by Marcus99; June 6th, 2017 at 03:30 PM.
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June 6th, 2017, 03:34 PM #2
Re: 20 MOA base install
http://warnescopemounts.com/20moa-explained/ These folks say yes.
Why would anyone need a 20MOA base? A 20MOA base is only needed for certain applications. When a shooter is adjusting the elevation dial on the scope for ranges longer than what the gun is zeroed for, at some point, they will run out of elevation in the scope. In many instances this is around 600 yards, give or take. For example, if a shooter had a scope with 40MOA of total elevation travel, and the rifle was zeroed at 100 yards in the center of that travel, they would have 20MOA worth of adjustment both up and down. When the rifle is zeroed in the center of the scope travel, there is 20MOA worth of down adjustment that will never be used. In its most basic form, a 20MOA base allows you to use that extra 20MOA of travel in the scope that was not being used. So in this case, if the shooter had a 20MOA base, the rifle would be zeroed at the end of its elevation travel, and the shooter would have 40MOA of elevation at their disposal, allowing them to shoot longer distances.
How does a 20MOA base work? A 0MOA base is considered flat, or level with the bore of the gun. A 20MOA base is canted down in the front toward the barrel. By canting the base down in the front, this is what allows for more usable elevation adjustment in the scope. To many shooters who are not familiar with the concept, canting a scope down in front sounds incorrect. They feel it makes more sense to them if the scope is pointed up. To help explain how this works, please take a look at the illustration below.
If we had a rifle with a 0MOA base, and there was a laser going through the middle of the scope, and the middle of the rifle bore that went forever, and lets say the rifle was zeroed at 100 yards, those 2 lasers would intersect at that 100 yard target. If we then changed to a 20MOA base, the scopes laser would be on target, and the rifles laser would be hitting the target 20 inches high. This is essentially how a 20MOA base works, since you are now hitting 20 inches high, you can dial the scope back so the rifle is zeroed at 100 yards again, and you have an extra 20 inches of elevation to work with.
A 20MOA base is not always the best base to use, depending on the rifle and its purpose. In some cases, the scope being used when being paired with a flat shooting cartridge, cannot dial the added 20MOA of elevation out to keep the gun zeroed at 100 yards. The rifle must then be zeroed to 200 or 300 yards. This will entirely depend on the combination of rifle, scope and cartridge, so it is important to know how much MOA of elevation travel a scope has when deciding whether or not to purchase a 20MOA base. In situations where a ballistic compensating reticle is being used for long range shooting, a 20MOA base may not be needed, because the shooter is not adjusting the elevation dial. Since the elevation is not being changed on the scope, a 20MOA base would serve no purpose.Illegitimus non carborundum est
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June 6th, 2017, 03:38 PM #3Super Member
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Re: 20 MOA base install
Thanks
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June 9th, 2017, 11:51 PM #4
Re: 20 MOA base install
If you're going to pay the money for a Nightforce base, consider bedding it. I've rarely had bases that didn't need bedded and you know your scope isn't stressed. Devcon 10110 isn't cheap, but it's worth it.
Lycanbedsbasesbeforeactionsthrope
I taught Chuck Norris to bump-fire.
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June 30th, 2017, 09:15 AM #5Senior Member
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Re: 20 MOA base install
As mentioned look to see if it needs to be bedded. There are good tutorials online. I used JB weld and have yet to see an issue with it.
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