Rifle Scopes 20 MOA or 30 MOA base?

JCB

Private
Minuteman
Feb 22, 2006
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1
Tennessee
I'm excited to be working on my first bolt gun project. I'm starting out with a 700 .308. I've been looking at various scopes, seeing the new IOR Valdada FFP 6-24x56 it looks like it could be a good fit. I want to learn to use a mil/mil set up and I plan to shoot mostly steel out to 1000 and potentially as far as 1200 yards with an occassional F-class match thrown in there. In what I've read on this site it seems the elevation range of this optic is not as broad as some others. This leads me to the subject of my post. Would a 20 MOA base or a 30 MOA base be the better option and would there be a problem getting a 100 yd zero when using a 30 MOA base?
 
Re: 20 MOA or 30 MOA base?

I don't know the adjustment range of IOR. Assuming it's wide "enough", IMHO 30 MOA base would be a better choice for long-range applications. There should be no problem with a 100 yd zero - I've zeroed Vortex Razor HD at 100 yd on a 40 MOA base.
 
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Re: 20 MOA or 30 MOA base?

You might need to check the adjustment range on the IOR. A 30 MOA base will require the absolute minimum of 60 MOA of adjustment. I would actually want 65-70 to be on the safe side. I'm not sure what that scope has, but its going to be pushing it. I know the Razor has considerably more than the IORs.
 
Re: 20 MOA or 30 MOA base?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JCB</div><div class="ubbcode-body">I'm excited to be working on my first bolt gun project. I'm starting out with a 700 .308. I've been looking at various scopes, seeing the new IOR Valdada FFP 6-24x56 it looks like it could be a good fit. I want to learn to use a mil/mil set up and I plan to shoot mostly steel out to 1000 and potentially as far as 1200 yards with an occassional F-class match thrown in there. In what I've read on this site it seems the elevation range of this optic is not as broad as some others. This leads me to the subject of my post. Would a 20 MOA base or a 30 MOA base be the better option and would there be a problem getting a 100 yd zero when using a 30 MOA base? </div></div>

Valdada states the new version has 16 mils of travel, which equates, by my math, to 55 MOA, which isn't a lot. I'm thinking that 20 MOA is a given and probably the 30 MOA rail would be better with that scope and out past 1200yds. I had the original 6-24x 35mm and I thought it had 65 MOA, but that's no matter to you.

Chris
 
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Re: 20 MOA or 30 MOA base?

IOR 6-24x56mm 16 mils of adjustment (57.6")
Vortex Razor HD 5-20x50MM 36 Mils of adjustment (129.6")

I don't think a 30 MOA base and the IOR 6-25x56mm is a good fit. 20 MOA would work I would think.

Bob
 
Re: 20 MOA or 30 MOA base?

Where are you going to be doing the majority of your shooting? With a .308 I'd say under 1000 yards and occasionally going for it to 1200. A 20 moa base should get you there. More importantly it will keep the scope optically centered in the middle of your lenses for more of your shooting.

If you put on a 30 moa base, normal range shots will not be using the center of your adjustment range and thus will not be using the optical center of you scope, where the best vision is. Unless you live on a 1000 yd range, probably 90% of the bullets going down your bore will be aimed at less than 600 yards. A .308 is a good choice for a first or only gun. Use it to learn and set it up to make it easy. A 30 moa base is for a .338 LM or such that is only for long, long shots and that you do not use for the majority of your shooting (unless you are a professional and have already fired 10's of thousands of shots down range). Just my opinion.
 
Re: 20 MOA or 30 MOA base?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dinc</div><div class="ubbcode-body">Where are you going to be doing the majority of your shooting? With a .308 I'd say under 1000 yards and occasionally going for it to 1200. A 20 moa base should get you there. More importantly it will keep the scope optically centered in the middle of your lenses for more of your shooting.

If you put on a 30 moa base, normal range shots will not be using the center of your adjustment range and thus will not be using the optical center of you scope, where the best vision is. Unless you live on a 1000 yd range, probably 90% of the bullets going down your bore will be aimed at less than 600 yards. A .308 is a good choice for a first or only gun. Use it to learn and set it up to make it easy. A 30 moa base is for a .338 LM or such that is only for long, long shots and that you do not use for the majority of your shooting (unless you are a professional and have already fired 10's of thousands of shots down range). Just my opinion. </div></div>

I guess it does come down to how often he's going to shoot at longer distances, but 55 MOA of total travel isn't a lot especially when you figure Murphy's Law will rear it's head and he'll probably be left with LESS than half that after the scope gets mounted, so what--27-28 MOA?

He'll be using holdover anyhow, so I guess he's damned if he does, damned if he doesn't?

Get the 30 MOA rail and set your zero at 300 yards, lol.

Chris
 
Re: 20 MOA or 30 MOA base?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ChrisGarrett</div><div class="ubbcode-body">Valdada states the new version has 16 mils of travel, which equates, by my math, to 55 MOA, which isn't a lot. I'm thinking that 20 MOA is a given and probably the 30 MOA rail would be better with that scope and out past 1200yds. I had the original 6-24x 35mm and I thought it had 65 MOA, but that's no matter to you.

Chris </div></div>

55 MOA of total travel means 27.5 of elevation which probably means 25 by the time it's mounted and zeroed.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JCB</div><div class="ubbcode-body">Would a 20 MOA base or a 30 MOA base be the better option and would there be a problem getting a 100 yd zero when using a 30 MOA base? </div></div>

A 20MOA base will give you 45 up and 5 down and allows you to zero at 100 yards. 30 means you lose the 100 yard zero you want and you would have to zero at 200 or 300 and hold under to shoot at 100 yards as Chris suggested..
 
Re: 20 MOA or 30 MOA base?

Thanks for all of the help. It sounds like a 20MOA base is the better choice. The majority of my shooting is definitely going to be less than 1000 yards. The closest range to me is only 100 yds so that is where the majority of my practice will be. I just don't want to end up with an optic set up that doesn't work well with the rifle.

Do you see the IOR 6-24 as a good choice or would that be going down the wrong road? Would their be other scopes that you would see as a better choice that are in the same price range?