Validation issue with 6.5 CM and 143 ELD-X

Discussion in 'Reloading' started by Lpart, Sep 21, 2018.

  1. Lpart

    Lpart Well-Known Member

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    I was out yesterday helping a friend pull data together for his 6.5 CM in a Ruger Precision Rifle. Using the 143 ELD-X and 42.1 gr H4350. Labradar gave me a velocity of 2650 with SD about 10. Applied Ballistics gave me a come up of 13.5 moa with a 100 yd zero. We then set up a target at 600 yards and shot a 5 shot group with this come up. Group was at 1 moa but 20 inches high. I had to adjust the velocity all the way up to 2994 to get the correct solution. I have never had such a large adjustment before (I usually only need an adjustment of 50fps or less when doing this). Can you see any reason for this result? My own 6.5 CM with a 24" Barlein #4 comes in at a validated 2800 fps.
     
  2. Canhunter35

    Canhunter35 Well-Known Member

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    What bc did you use?
    I use a g7 of .303
     
  3. Barrelnut

    Barrelnut Well-Known Member

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    Scope dialing correctly? Wrong zero entered in app?
     
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  4. Lpart

    Lpart Well-Known Member

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    Used ABS G7 of .297. Zero was set properly. Scope is Nightforce SHV and dialing was accurate at 200 yds
     
  5. Dog Rocket

    Dog Rocket Well-Known Member

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    Did you dial 13.5 total, or come up 13.5 from your 200?
     
  6. Canhunter35

    Canhunter35 Well-Known Member

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    Check your zero and do a box test with the scope to check it’s tracking
     
  7. Lpart

    Lpart Well-Known Member

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    Dialed in 13.5
     
  8. An Idahoan

    An Idahoan Well-Known Member

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    I don't want to insult you, but is the distance between the optical axis and line of departure (bore) entered correctly? Applied Ballistics has a default that must be changed to each setup.
     
  9. Lpart

    Lpart Well-Known Member

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    I believe so. He has a 56mm scope and has very high rings. I measured it at 2.5 inches and did put that into the program.