20 moa base and scope question.

[tammons]

Lets say I am shooting at 1000 yards and I run balistics with the rifle set at zero and I have a 360 inch drop at 1000 yards.

I am interested in using a burris black diamond 8-32x scope which only has 39moa of internal adjustment.

Thats roughly 19 moa vert if the mount is perfect.

I need 36 moa to compensate at 1000 yards. 20 moa from the mount and 16 moa from the scope.

Fine. Now lets say I want to shoot at 100 yards with the same rig. From the way it looks I would not be able to zero the rifle at 100 yards unless I am wrong.

I guess a nightforce with 50 moa internal would help, but I really dont want to spend that much on a scope.


Anybody have a link on how to set up a long distance scope and retain some function at lower yardages.

 

[ken4570tc]

Burris Signature Zee Rings with Offset Inserts can give you another 20MOA. The only draw back would be changing the inserts everytime you want to change from shooting 100/1000. You'd have to sight in each time you made the change.

 

[tammons]

Thats what I dont want to do. I want to set the rings and or base and be done with it.

I want to be able to zero at 100 and zero at 1000 with a 20 moa scope base.

Tell me if this is right ??

If I had a 50 moa scope it would help at least from what I can figure. That would give me 25 vert up/down so with the scope mounted on that 20 moa base to zero sight 100 yards I would need the scope set down 18 moa. Down 18 would leave me 7 down and 43 moa up or enough to do what I want.

With the burris 8-32 it would be bottomed out at 100 yards.
and barely able to reach a 1000 yard setting ??

 

[ronemus]

A Leupold Long Range scope,30 mm tube) is roughly half the price of a Nightforce, and is a high-quality optic. I have a 6.5-20x50 LRT and a 4.5-14x50 LR that have ~80 MOA of adjustment - the range of adjustment depends on the power. I've had no problems with them in 8 years of competition use and am very satisfied.

 

[tammons]

Yes I am familiar with CA, whatnot and why you want to be in the center of the scope. I am going to build a 1000 yard gun later this year and will probably set it up with a high power leopold and a base set up for 500-1000 yards.

For this rifle. I want to shoot in a stock class and probably out to 600 yards most of the time. I do want to have the option of shooting out to 1000 yards if I want, but its going to be more of an all around gun.

I have decided to skip the burris and go for a Leopold VX-III 8.5-25x scope. It has 72 moa internal so half of that is 36. I will probably use bussis signature zee rings on a flat base, and in that case I could use the concentric rings and almost get there or the 005 rings for 5 or 10 extra moa.

Thanks

 

[rayfromtx]

This was posted on another site and there seems to be a common misconception about how the sig zee ring inserts work. I have copied my response here from that thread. It references a post from there but is on the same subject. This is not a direct responce to Ken's post.

A couple of small corrections. The sig zee rings are measured in thousands, not moa. If you use a -20 on one end and a +20 on the other, you will get 40 thousands of adjustment. How many moa that comes out to is determined by the distance between the rings. If the distance between the rings is short, then the shift will be greater than if the rings have more space between them. On my bvss, as an example, I used an extended base and with 40 thousands of offset in the rings, I only got about 15 moa of adjustment, near as I can tell. I started with 45 moa of vertical adjustment on my zeiss conquest 6.5-20x50 scope. I now have around 8 moa of down adjustment and 37 moa of up adjustment from 200 yards. That is shy of what would be required to zero at 1000 yards with most loads out of a 243. I can use my mildot to get the remainder if I do some math.

One other thing. In order to shoot long, you need to maximize your up travel in the scope. To do this, you want the barrel to be aimed higher in relation to the scope. That means you want to raise the back of the scope and lower the front of the scope. Put the +20 in the rear and the -20 in the front for maximum benefit with the sig zee rings. The inserts come in pairs, so if you put +20 on the bottom of the rear ring, you should put -20 on top of the rear ring and vice versa for the front ring. The kit doesn't come with that many 20s so I used the 10s on top to compliment the 20s on the bottom. I think it works although not recommended by the manufacturer.

If I screwed any of this up, I'm more than willing to be corrected.

Burris Signature Zee Rings with Offset Inserts can give you another 20MOA. The only draw back would be changing the inserts everytime you want to change from shooting 100/1000. You'd have to sight in each time you made the change.

 

[ken4570tc]

Ray,

You've pretty much got it correct. I was not trying to suggest that the Burris inserts themselves were marked in MOA or that there were +/-20 inserts. I was simply communicating that the offset system was capable of 20MOA of offset. It would be entirely up to the individual through careful attention to the included instructions and bench testing to achive the desired results.

Ken Taylor

 

[Fred Bohl]

Another way to handle the offset problem so you can keep the scope adjustment closer to center and cover 100 to 1000 yards and beyond is to use Ivey adjustable rings or rail.

http://www.iveyshooting.com/default.htm