MOA settings at longranges

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Methow Packer, Dec 10, 2013.

  1. Methow Packer

    Methow Packer Well-Known Member

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    I want to make sure I understand the ballistic turret adjustment. Example: I range my shot at 900 yards. Bullet drop is 177. inches. Do I divided the drop inches 177. by 9 to get the MOA to adjust the turret. Roughly 19.6 MOA? Thanks
    Ted
     
  2. BrentM

    BrentM Well-Known Member

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    Correct. Close enough. 19.67 or 19.7. So if I spotted and determined your shot was 177 low I would say come up 19.7 MOA. 1 MOA is not exactly 1" but it is close enough for most of us.
     

  3. NomadPilot

    NomadPilot Well-Known Member

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    Better method is not to use inches in the first place. Set the ballistic calculator units to MOA and dial that. No math required.
     
  4. BrentM

    BrentM Well-Known Member

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    I think you missed his point. He was confirming drop to convert to MOA. He is working toward understanding the relationship. I beleive he has the correct understanding. To further his point, if I see an impact of his at 10 inches low at 1000 yards and told him that, he would adjust his turret 1 MOA up in elevation. I agree math is not fun in the field at times but sometimes have to use it. If he is 20 inches right at 800, someone is going to have to do the math to make the windage adjustment.
     
  5. JackinSD

    JackinSD Well-Known Member

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    I guess it depends on how rough you would like the adjustment to be. Using your rough numbers you would end up shooting about 7 1/2" high. It gets worse the farther out you go and better the closer you are. The actual adjustment is much closer to 18.75. IPHY you would correct.
     
  6. Methow Packer

    Methow Packer Well-Known Member

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    Thanks guys. I see all your points. Well put. No matter how you look at it, it's going to come down to some math at some point. Inches converted to MOA is an important bit of knowledge needed IMO
     
  7. BrentM

    BrentM Well-Known Member

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    1.047 is the actual number. That 1.047 inchs per MOA. 177/1.047 = 169.05 / 9 = 18.78

    Good point about the concise math. The bigger the number the bigger the error.

    You are still correct in general about the "idea" behind inches to MOA, but I agree with the other guys for sure and they make a very valid point.