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Ballistic program not matching actual

 
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  #1  
Old 10-26-2011, 09:53 PM
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Location: texas
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Ballistic program not matching actual

I'm new at the long range shooting (past 600). I've not posted but have researched here alot. My exbal program is not computing the correct drop and wind corrections. I use a kestrel 4000 and even took my chronograph last time, recording data on every shot. I have data on 2 rifles and both need more MOA than the exbal program is telling me. The difference is greater with distance, with approximatly 4 moa difference at 1000 yards. I've tried to plug in different variables into the program but cannot get it correct.
Is there any common mistakes that might be the problem? Any help would be appreciated.

Thanks,
Cary
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  #2  
Old 10-26-2011, 10:04 PM
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Re: Ballistic program not matching actual

Post up a little more info, on the rifle and the inputs you've been using, it will help! Have you done a trajectory validation?
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  #3  
Old 10-26-2011, 11:15 PM
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Re: Ballistic program not matching actual

Lots of data: 308 DPMS, 168 SMK, 2806-2875fps through out the day, 1280', avg. 83 F, avg. BP 30.07, avg. humidity 48.9%

first moa is actual hold - where it impacted, adjustment the computer called for

100: zero
200: 1.75 moa - center, comput: 1.5 moa
300: 4.0 moa - 2" low, comput: 4.0
400: 7.0 moa - center, comput: 6.75
500: 10.0 moa - 3" low, comput: 9.75
600: 14.0 moa - 2.5" low, comput: 13.25
700: 19.0 moa - 3" low, comput: 17.25
800: 25.0 moa - 3" low, comput: 21.75
900: 30.75 moa - center, comput: 27.0
1000: 38.5 moa - 6" high, comput: 32.75

Thanks,
Cary
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  #4  
Old 10-26-2011, 11:20 PM
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Location: texas
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Re: Ballistic program not matching actual

Yes, i did a trajectory validation. It helped but not alot. It would get the longer ranges closer but make the near ranges further off.

Cary
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  #5  
Old 10-26-2011, 11:26 PM
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Re: Ballistic program not matching actual

What scope are you using? Are you sure you are dialing MOA vs IPHY?

Did you measure your scope height above the bore?

Maybe a lot of little errors compounding?
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  #6  
Old 10-26-2011, 11:30 PM
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Re: Ballistic program not matching actual

leupold LR with target turrets, 1.6" above bore.
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  #7  
Old 10-27-2011, 02:28 AM
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Re: Ballistic program not matching actual

Assuming all the data is input correctly, I'd try a tracking evaluation on the scopes adjustments. Just to make sure the adjustments are moving the reticle the advertised amounts.
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