Rifle Scopes 20 MOA Base + 6Mil Spuhr Mount = Maybe?

[NV Ranger]

I am about to get my build back from my smith and it's time to pick a set of rings/mount. Rifle is: .308 w/ 23" 1:10 5R Lilja in an AICS topped by a Badger 20 MOA base. The scope is probably (99.99% sure) going to be: a Steiner 5-25x56mm w/ MSR reticle (26Mils of elevation)

I'm looking heavily at a Spuhr mount. I'm torn between getting the 0Mil/0MOA and the 6Mil/20.6MOA. The 6Mil mount combined with the 20MOA base will get me starting at right around 1Mil from the bottom of the 26Mil range (26/2=13-6-6=1). Doesn't give me a lot of wiggle room for a 100 yard zero.

I plan to shoot out to 1200/1300 yards on an occasional basis, but mostly from 300 to 1000.

The reason I'm looking at the 6Mil mount is if in the future I move the scope/mount to a AR308 platform or some other gun that has a 0MOA top rail I would want to be able to have as much elevation available as possible.

Cutting to the chase, I have heard that using a 20MOA base combined with a 20MOA mount can cause the scope image to become more oval shaped. Should I be concerned? Any other issues I don't know about? What would you guys do?

 

[NoLegs24]

1 mil = 3.438 MOA. So you'll have 40 moa can't in total, which should def be fine to be zeroed at 100 yds/meters. My AI PSR has a 30 moa can't built in the rail with a spur mount that has 0moa/mil. I put my SB 3-27 and use around 7 mils of elevation to get me dialed in at 100 yards. doesn't matter since that scope has 38-40 mils of internal elevation. Don't know how much the steiner has in internal elevation. but you should def be fine with the 6 mil mount. The SB 5-25 usually require about a 45moa can't in order to get the full 26 mils of elevation and not have to sacrificed some while zeroing. I had an AI AX338 with 30moa rail plus a 30 moa larue mount with my old SB 5-25 but it was way too much to be zeroed at 100. I was bottomed out and still was shooting 3 mils high.

 

[NV Ranger]

Legs,
When you were running 60 MOA down did you notice anything when looking through the scope? Spuhr, on their website, says that too much angle can cause the image to appear oval.

"However when mounted in this extreme elevation it’s common to experience optical defects such as an oval picture etc."

 

[NoLegs24]

No it was fine to me since the AX has an adjustable cheekpiece. I would assume so if you didn't have an adjustable cheekpiece since the ocular is much higher and is tilting downwards on the objective lens. I would say you should be fine with that setup and it'll save you a lot of mil travel in your elevation. Call the guys at Mile High Shooting Accessories and they'll def point you in the right direction since they're a distributor for Spuhr and very well knowledge.

 

[Earnhardt]

Zombie thread revival...

Anybody else done this lately?... Put a 20 MOA scope mount on a 20-30 MOA Built-In Rail?

I have a .338 Edge Deviant Long action with a 30 MOA rail, and I'd like to put a NF or Spuhr 20.6 MOA mount on top for a total of 50.6 MOA

My Trijicon 5-50x has an advertised elevation adjustment of 100 MOA, but I'm reading that guys with the same scope are doing testing and it's ending up at around 115 MOA of elevation adjustment...

Thanks

 

[spife7980]

Zombie thread revival...

Anybody else done this lately?... Put a 20 MOA scope mount on a 20-30 MOA Built-In Rail?

I have a .338 Edge Deviant Long action with a 30 MOA rail, and I'd like to put a NF or Spuhr 20.6 MOA mount on top for a total of 50.6 MOA

My Trijicon 5-50x has an advertised elevation adjustment of 100 MOA, but I'm reading that guys with the same scope are doing testing and it's ending up at around 115 MOA of elevation adjustment...

Thanks

Zero it with a set or normal rings if you have a set you could test with first and see where you’re at first before investing in too much cant?

 

[Seandradamus]

30 moa rail and a 6 mil Spuhr and I could not zero my TT or Kahles at 100.
20 rail and 6 mil Spuhr worked great