close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Long Range Scopes and Other Optics

Long Range Scopes and Other Optics Nightforce Optics


Reply

Determining Actual MOA When Using Burris Signature Zee Rings

 
LinkBack Thread Tools Display Modes
  #1  
Old 05-20-2013, 07:37 AM
Silver Member
 
Join Date: Oct 2012
Location: Windsor, VA (but heading for the Rockies)
Posts: 372
Determining Actual MOA When Using Burris Signature Zee Rings

I was doing some research regarding the actual MOA gained when using Burris Signature Zee rings and came across quite a bit of good information. I've tried to compile the nexus of my research. I want to thank everyone who helped me out in this effort. Please feel free to make contributions and corrections as needed. (ps, be gentle, this is my first endeavor! )

Hope this helps some of ya'll, Doc

Determining Actual MOA When Using Burris Signature Zee Rings

Method 1- Using 100 yd. shift method:*

> Formula:

[( Total Offset / Ring Spacing) x 3600] / 1.047 = MOA @ 100 yds

-Total Ring Offset = Total of Ring Insert Dimension (e.g. Using 0.010 inserts = 0.010 + 0.010 = 0.20)
-Ring Spacing = Distance rings are spaced apart in inches (measured to 0.001 inches)
-3600 = Inches in 100 yds
-1.047 = inches per MOA

+Example:
>Using 30mm Burris Signature Zee Rings w/0.010 ring inserts

• Total Ring Offset = 0.010” + 0.010 “= 0.020”
• Ring Spacing = 3.546” (picatinny standard rail slot spacing = 0.394”, 10 picatinny slots = 3.940”, therefore 9 picatinny slots = 3.546”)
• [(0.020 / 3.546) x 3600] / 1.047 = MOA
• [(005640157) x 3600] / 1.047 = MOA
• [20.3045652] / 1.047 = MOA
• 19.393089 = MOA

Therefore using 30mm Burris Signature Zee Rings, MOA gain using standard picatinny rail is:

21.7 MOA @ 3.152” spacing ( 8 standard picatinny slot spacing)
19.3 MOA @ 3.546” spacing ( 9 standard picatinny slot spacing)
17.4 MOA @ 3.940” spacing (10 standard picatinny slot spacing)


Method 2 – Using arc tan Method:**

> Formula:

Arc tan ( A / B ) / 0.0167 = MOA

-A = Total Ring Offset = Total of Ring Insert Dimension (e.g. Using 0.010 inserts = 0.010 + 0.010 = 0.20)
-B = Ring Spacing = Distance rings are spaced apart in inches (measured to 0.001 inches)
-0.0167 deg (or 1/60 degree equivalent to 1 MOA)
-Arc tan = arc of the tangent


+Example:
>Using 30mm Burris Signature Zee Rings w/0.010 ring inserts

• Total Ring Offset = 0.010” + 0.010 “= 0.020”
• Ring Spacing = 3.546” (picatinny standard rail slot spacing = 0.394”, 10 picatinny slots = 3.940”, therefore 9 picatinny slots = 3.546”)
• Arc tan (0.020 / 3.546) / 0.0167 = MOA
• Arc tan (0.005640157) / 0.0167 = MOA
* Using a scientific calculator: (0.00560157 {inv tan}) to obtain arc tan result = (0.323153818)
• 0.323153818 / 0.0167 = MOA
• 19.3505 = MOA

Therefore using 30mm Burris Signature Zee Rings, MOA gain using standard picatinny rail is:

21.7 MOA @ 3.152” spacing ( 8 standard picatinny slot spacing)
19.3 MOA @ 3.546” spacing ( 9 standard picatinny slot spacing)
17.4 MOA @ 3.940” spacing (10 standard picatinny slot spacing)

As is evident, the further apart your Burris Signature Zee Rings are the less MOA advantage you will obtain. If you are using 1inch Burris Signature Zee Rings two counter opposed 0.020 inserts might be recommended to obtain 20 MOA with greater ring spacing.

I utilize the 30mm Burris Signature Zee Rings with the 0.010 inserts because they, along with 0.00 inserts, are the only inserts currently supplied. Therefore to obtain a 20 MOA advantage a closer ring spacing of 3.152 inches or 3.546 inches must be used. Apparently, I assume, this closer ring spacing is the reason Burris has ‘beefed’ up the 30mm rings when compared to the 1inch rings.

When using Burris Signature Zee Rings always ensure the inserts are opposed, with the ‘fat’ insert on the bottom in the rear ring, and ‘fat’ insert on top in the front ring. This lifts the rear and lowers the front of the scope to obtain increased MOA and increased scope area.


*extracted from Elevation Shift with Burris Sig Rings within AccurateShooter.com
**found in LongRangeHunting.com online magazine forum. I wrote down the formula but can’t find the thread to reference. My Bad.
__________________
http://www.heaven-scent-rescue.org

"History does not long trust the care of freedom to the weak or timid" Dwight David Eisenhower
Sic Semper Tyrannis...Veritas et Aequitas

Reply With Quote

  #2  
Old 04-08-2015, 02:42 PM
Bronze Member
 
Join Date: Jun 2014
Posts: 44
Re: Determining Actual MOA When Using Burris Signature Zee Rings

Great post! Thanks for the info.
Reply With Quote
  #3  
Old 04-10-2015, 09:53 PM
Junior Member
 
Join Date: Feb 2015
Posts: 19
Re: Determining Actual MOA When Using Burris Signature Zee Rings

Thanks for the post, quite informative and something I have never considered. Learned something new.
How do you like the zee rings?
Reply With Quote
  #4  
Old 04-15-2015, 05:04 AM
Platinum Member
 
Join Date: Mar 2014
Location: Ohio
Posts: 1,331
Re: Determining Actual MOA When Using Burris Signature Zee Rings

Good info, I pinned it to my phone for future reference. As for the question about liking the Burris rings, they are a brilliant idea, they are very sturdy steel rings. The inserts are a solution to alot of scope problems other than elevation. They also keep my expensive scopes from being marred. The only complaint is the back order of the inserts.
__________________
"those who hammer their guns into plows will plow for those who do not" Thomas Jefferson.

an armed man is a citizen. An unarmed man is a subject.

guns have only two enemies, rust and politicians

know guns,know peace,know safety.no guns,no peace,no safety...

The second amendment is in place incase the politicians ignore the others


Free men do not ask permission to bear arms.

For those who trade liberty for security have neither Benjamin Franklin...
Reply With Quote
  #5  
Old 04-16-2015, 12:59 PM
Silver Member
 
Join Date: Aug 2013
Posts: 275
Re: Determining Actual MOA When Using Burris Signature Zee Rings

Quote:
Originally Posted by gohring3006 View Post
Good info, I pinned it to my phone for future reference. As for the question about liking the Burris rings, they are a brilliant idea, they are very sturdy steel rings. The inserts are a solution to alot of scope problems other than elevation. They also keep my expensive scopes from being marred. The only complaint is the back order of the inserts.
The other day I mounted scope that I could not get sighted in. I switched to Burris Signatures and used a +20 in one side and a -20 in the other in a vertical orientation in the rear ring. Worked like a charm. While I was at it I used a -10 in the bottom and a +10 in the top of the front ring to bring the centered crosshair almost to sighted in without adjusting the scope.
Reply With Quote
  #6  
Old 04-16-2015, 06:39 PM
Silver Member
 
Join Date: May 2012
Location: Lebanon County PA
Posts: 425
Re: Determining Actual MOA When Using Burris Signature Zee Rings

My brain hurts from all that math stuff. I take a more practical (for me at least) approach. I install the rings lined up vertically, go to the range and zero the rifle, go back to the workbench, attach my collimator and note the reticle position against the grid, pull the scope and reset the internal adjustments to center (mostly I want the windage turret centered) then turn the offset inserts to put the reticle back on the grid just as it was (for windage) then set the elevation turret to zero the vertical again. On my 20 MOA rail I end up within one rotation of the bottom of turret travel.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes



All times are GMT -5. The time now is 02:43 PM.


Powered by vBulletin ©2000 - 2015, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC