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Shimming a Base/Scope

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/24/2014 at 18:27
DesertDog View Drop Down
Optics GrassHopper
Optics GrassHopper
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Joined: February/01/2014
Location: Maine, USA
Status: Offline
Points: 8

Does anyone know approximately how much thickness in a shim under the scope base relates to how many mils/moa's you gain from using the shim..?


Example: Shim Thickness of .020 = ?? mils/moa's


Any help would be appreciated...


Thanks,


DD

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/24/2014 at 23:16
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Dark Lord of Optics

Joined: June/15/2004
Location: United States
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This depends on the action length and the base type.
 
ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/26/2014 at 01:13
Gerry Atric View Drop Down
Optics Apprentice
Optics Apprentice
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Joined: April/21/2011
Location: Sweden
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Points: 197
I have used this formula:
 
Distance you want to move POI (bullet impact) / shooting distance x  distance between outside of rings  = shim thickness
 
(All measurements in same units)
 
I have used this formula to determine which pos-align inserts to use in my Burris Signature Zee rings. (I prefer those rings instead of shimming individual bases/rings)
 
Edit: outside of rings
  
Gerry Atric


Edited by Gerry Atric - February/26/2014 at 23:57
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/26/2014 at 08:06
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Optics Jedi Knight
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Joined: January/08/2007
Location: Oklahoma
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Points: 7180
2 piece base: For the movement at 100 yards divided by the distance between outside of the rings. (This has to be very precise) times the height of the shim. Say the distance between the outside of the rings is 5.025" 100 yards =3600 inches shim .020
3600/5.025=716.418*.020=14.328"
On a 1 piece rail measure the distance from the opposite end of the rail where the shim is placed. Ring spacing will not be used.
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