Zeiss and Vortex Adjustment with 20 MOA

Discussion in 'Long Range Scopes and Other Optics' started by ovastafford, Apr 13, 2012.

  1. ovastafford

    ovastafford Well-Known Member

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    I have a zeiss 4.5x14x44 and on the Zeiss website it says that it has a square adjustment range of 42.8 inches. With this would I be able to use a 20 moa base with a 200 yard zero?

    I also have a Vortex 4-15-50 Viper HS. On their site it says there is 50 moa adjustment. With this will I be able to also get a 200 yard zero with a 20 moa base?

    Thanks
     
  2. bruce_ventura

    bruce_ventura Well-Known Member

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    In theory, yes, the Zeiss can get there with 42 MOA. However, manufacturing tolerances can be a problem. With 42 MOA adjustment, you don't have much room for error. You've got about 6 MOA to spare, to be precise. In a production rifle, a zero MOA base could easily be vertically mis-aligned from the bore by more than 8 MOA.

    You may have to shim or bed your base 10 or 20 thou to correct that error. When installing the scope, I recommend you you use an arbor boresight collimator to assess base alignment and dial in your base. I would not hesitate to do it, because the Zeiss glass is worth the effort.

    Alternately, if you use a mildot reticle, you can zero at 200 yds using one of the dots above the crosshairs. You can add 10 or so MOA that way.
     

  3. gamehawker

    gamehawker Well-Known Member

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    Could you possibly bottom out a Zeiss Conquest 6.5-20x50 with a 100 yard zero using a 20 MOA Picatinny Rail?

    My IWLA fellow member can only adjust the turret to an 1 inch high (he can not adjust the turret any further down) at 100 yards with his Zeiss Conquest 6.5-20x50 and he has the scope on a 20 MOA Picatinny Rail.

    The Zeiss website says the 6.5-20x50 Conquest has a square adjustment range of 45.4 inches.

    Thanks
     
  4. gamehawker

    gamehawker Well-Known Member

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    Update:

    I called Zeiss about two weeks ago and they said they recommend a 20 MOA rail. But when I told them the cailber was a 7mm STW and shooting out 140 grain bullets at least 3,300 fps at the muzzle they said it would not work because the bullet was going too fast.

    I suggested to them what if I replaced the 20 MOA rail with a 15 MOA rail. They said it would work then.
     
  5. Sully2

    Sully2 Well-Known Member

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    EGW 15 MOA's are all I have because I dont need the range that a 20 MOA rail might give me