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Need a 40 moa base

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Unread 06-12-2008, 06:00 AM
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Join Date: Dec 2007
Location: Ontario, Canada
Posts: 182
Originally Posted by geargrinder View Post
An EGW 25MOA rail will work very well with your XTR rings. That's the setup I'm using on my Savage.

But, be warned. You probably won't be able to zero at 100 yards. I have a Bushnell 3200 5-15x40 Tactical scope with 50MOA of adjustment. To shoot at 100 yds I have to hold 2 mil dots low or roughly 7MOA.


I have a 40 MOA on my PGWDTI Timberwolf in .338LM and my zero is 400yds.

If I want to shoot closer then I use the hash marks.
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Unread 06-12-2008, 07:52 AM
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Join Date: Jun 2007
Posts: 937
EGW base

I have a tactical Savage model 10 witha EGW 25 moa base on it. It has me zero at 100 about 16MOA off the bottom.

I'm shooting a VXIII with 90MOA adjustment though.

If you have only 50MOA of adjustment you better cross your fingers that your within 10MOA of the bottom to get where you want it.

I have enough clicks on my 308 with 178 grain amax to get me to 1200 yds

Another option if the tube is a 1" is go with Burris optiloc rings. You can interchange the +/- inserts to get where you nedd the scope to be. Most scopes I've seen with this setup have been able to be set within just a couple MOA off the bottom
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Unread 06-12-2008, 10:31 AM
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Join Date: Jun 2008
Posts: 31
I found out that the Bushnell has 44 MOA of total adjustment. Hang with me, I'm new at this and I'm probably going to mess this up.

Okay, so 44 total translates to 22 up and 22 down. So with 20 MOA base that would put me 2 MOA from the bottom (22-20 = 2). This would leave me with 42 MOA of upward adjustment (44 total - 2 = 42 upward adjustment).

Also, if I did the calculations right then my 2600 fps, .505 BC, 175 gr. bullet will drop roughly 154" at 1,000 yards. The scope has 12 MOA per revolution. This translates to me needing to adjust about 3.2 revolutions around.

So 3.2 revolutions would equal 38.5 MOA. So if this is correct then 42 MOA of upward adjustment would work.

I am not a betting man but if I was I would say some if not all of that is probably wrong. That being said, I need your help. Is there a way to tell without mounting the scope or do I just need to mount the scope and zero it at 100 yards and then see how much adjustment I need to get to 1,000 yards?

Thanks for the help so far, and I hope this is not all incorrect.

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Unread 06-12-2008, 11:06 AM
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Join Date: Jan 2002
Location: Wenatchee, WA
Posts: 806
I'm kind of surprised at that review... CSgunworks normally is right on the money, but on that one, he's off in the tulies. 44 moa elev, + 40 moa base, would put you unable to get a 100yd zero, by about 3-1/2 *feet*.

I don't know where you got '154 inches', but that number is way off. Try more like 'over 400 inches'... which is why you need to forget 'inches' and start thinking in MOA - or mils - to simplify the math. A 175gr SMK @ that speed is more like a flying bumble bee... something like 38-39 moa of up, and just barely supersonic when it gets there. There are better choices out there unless you are seriously married to that particular bullet/speed combination. Even just punting it out the gate a little harder (2650-2700fps is common) would leave you a little more breathing room as far as making it to the target supersonic.

44 moa of elevation, which *should* give you 22 moa of 'up'... except for it'd be a rare gun/scope combination in my experience that actually zeroed right at its mechanical zero (center) @ 100yds. Most likely you'll have to come up/down, right or left to get it zeroed. Using a 20 moa base should theoretically leave you w/ 2 moa off the bottom @ 100yds - which ain't much wiggle room, but it should work. From there, I'd suggest using some Burris Signature Zee rings w/ the inserts to 'tweak' your elevation requirements as needed. I'm not a huge fan of the ring design overall, but they do work nicely for things like this.

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Unread 06-12-2008, 11:23 AM
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Join Date: Jun 2007
Posts: 937

You need to mount the scope to see where your at. I'm not quite sure what your talking about with the 22moa up and 22 moa down. If the scope has 44 moa of travel this is what you have to work with. Now lets say you mount it and lucky enough with whatever combo you choose it puts you 4 moa off the bottom then you now have 40 moa of elevation to work with. Put your info into a ballistic program with your chrono speed and you will see how far you can click to. I do agree with the above get used to MOA and drop the inches thoughts. You start thinking inches when you shooting long distance your gonna get confused real quick.

Like I said before if your scope only has 44moa I recomend the burris rings if it is a 1" tube. They will get you real close.
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Unread 06-12-2008, 01:48 PM
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Join Date: Nov 2006
Location: Dayton, Nevada
Posts: 1,931
Based on your bullet weight, speed and BC. You'll need about 38 MOA to get to 1000yds. Your bullet will have 430 inches of total drop.

I wouldn't count on your scope giving you all 44 MOA of adjustment. I also wouldn't count on the base being exactly what it is supposed to be either.

My scope is supposed to be 50MOA and the base is supposed to be 25MOA. But when all said and done I'm missing 100 yard zero by 7MOA.
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Unread 06-15-2008, 12:26 AM
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Join Date: Mar 2008
Location: Collinsville,OK.
Posts: 250
I'd get a 20 or 25 moa base and a different scope with more adjustment. Maybe save up for one with a 30mm tube. They usually have more wiggle room.
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