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Thread: Moa help

  1. #1
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    Moa help

    Hi I just want some help to check if I'm doing this right, I sighted in a new scope and zeroed it at 200yds bullet dropped 10inch at 300, 32inch at 400, and 62inch at 500yds, now here is my prob, 500yds is 5 moa, 62 divide by 5 is 12 so I should adjust 12 moa is this correct? Because when I do this I was shooting well over the target I had to adjust back to 9 moa to hit the target and could not make sense of it, calibre is 308 scope is leupold mark 4 LR/T 8-25, any help would be appreciated

  2. #2
    Gone But Not Forgotten Toby's Avatar
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    If it drops 5moa dont you rise it 5moa?

    I actually have no idea but if something dropped 5moa I'd think you have to rise the sight 5moa to bring it back to zero.

    I'll go away now and leave it for someone in the know
    Last edited by Toby; 10-06-2014 at 10:15 PM.

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    You now know its 9 MOA to hit a target at 500yds so whats the problem? apart from being like me and not understanding the math of it all I just rely on shooter and validation.There will be some number crunching wiz along shortly hold tight.
    7mmsaum, veitnamcam, mikee and 1 others like this.

  4. #4
    K95
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    That's a lot of drop. I would be rechecking the 200yd zero. Even at 2600fps .308win should low fiftys for drop at 500yd with 200yd zero.

  5. #5
    By Popular Demand gimp's Avatar
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    What load are you using? Have you choreographed it?

    Yes 1moa = roughly 5 inches at 500 yards, so *if* you have 62 inches of drop it *should* be about 12.5moa of up to hit at 500.

  6. #6
    ebf
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    Balkie, the easiest way to do that calc is to ask : what is 1 MOA at this distance ?

    So at 500yds, 1 MOA is roughly 5 inches.

    If your correction is 62 inches, then divide 62 by 5 = 12.4

    Did you get the 62 inches from a balistics chart /program, or was it an actual measurement based on shooting 500yds ?

    Several things can be happening:

    Your range estimate might be incorrect
    Your input variables to the ballistics calc might be incorrect
    The click adjustments on your scope might be inaccurate
    Viva la Howa ! R.I.P. Toby
    Black rifles matter...

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    I did recheck the zero again before I finished, I thought it was a fair bit of drop also, rifle is suppressed but removed that and was still shooting the same groups, was shooting with federal fusion 180gr

  8. #8
    Almost literate. veitnamcam's Avatar
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    A MOA is not exactly One inch at 100y,also your scope may not adjust exactly 1MOA for one MOA adjustment.
    As neckshot said now you know its not a problem.
    And that is a hell of a lot of drop! running 208s-215s? I get a muzzle vel around 2500fps
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  9. #9
    Almost literate. veitnamcam's Avatar
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    Quote Originally Posted by superbalkie View Post
    I did recheck the zero again before I finished, I thought it was a fair bit of drop also, rifle is suppressed but removed that and was still shooting the same groups, was shooting with federal fusion 180gr
    Did some one cut it in half before fitting the suppressor?
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  10. #10
    Numzane Spudattack's Avatar
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    Quote Originally Posted by gimp View Post
    Have you choreographed it?
    I hope that was an autocorrect mistake!
    Blaser, ebf and Maca49 like this.
    "Here's the deal I'm the best there is. Plain and simple. I wake up in the morning and I piss excellence."

  11. #11
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    I had a range finder so distance was good and the 62inch was from testing not from chart, I would hope the scope is set right it not exactly a cheap and nasty scope

  12. #12
    By Popular Demand gimp's Avatar
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    Quote Originally Posted by Spudattack View Post
    I hope that was an autocorrect mistake!
    haha yes

  13. #13
    Numzane Spudattack's Avatar
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    Are you using the drop chart on the side of the ammo packet or have you calculated the 62"? Seems an awful lot and probably where the error is coming in.
    "Here's the deal I'm the best there is. Plain and simple. I wake up in the morning and I piss excellence."

  14. #14
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    2750fps is a rough guess if you came up 9 moa at 500 yds for 180gn projectile

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    Rifle is steyr scout which is fairly short barrel may explain a little more drop

 

 

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