Drop Chart Help?

Discussion in 'Long Range Hunting & Shooting' started by ovastafford, Sep 12, 2012.

  1. ovastafford

    ovastafford Well-Known Member

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    Whats up guys, I have been trying to do an updated drop chart for my gun and Im getting different answers for velocity from three different programs. I was going to see if I could get somebody to run my drops through their program and see what they get?
    Heres my data:

    6.5x284 140gr Berger VLD, 8 twist barrel

    728 yards 200 yard zero, 14.6 moa up.
    1010 feet elevation, 84 degrees, 56% humidity, scope height 1.75".

    I think that's everything,

    Thanks
     
  2. JackinSD

    JackinSD Well-Known Member

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    Using the G7 Ballistics Calculator on this site, I get 2846 fps.
     

  3. runshort

    runshort Well-Known Member

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    With the data given the Shooter program I have is showing a velocity of 2839 fps
     
  4. SBruce

    SBruce Well-Known Member

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    Exbal gives 2834'/sec.
     

    Attached Files:

    Last edited: Sep 13, 2012
  5. Clark

    Clark Well-Known Member

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    QL thinks 2864 fps muzzle with .264, 140, Berger VLD #26401- 504

    QL thinks it cannot be done with .264, 140, Berger VLD G7 #26501
     
  6. Greyfox

    Greyfox Well-Known Member

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    I use Ballistic FTE, G7 Br2 RF, and, BOTW, and NF. Get the similar data using all programs. I use G1. I also shoot and have field tested actual drops with my 6.5x284's. For your conditions., at 2832FPS I get a drop of 14.58. I am using around 53 gr. of H4831sc. I get 2941 FPS with this load in my Savage LRH.
     
  7. ovastafford

    ovastafford Well-Known Member

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    I appreciate all the responses. My Chronograph was giving me around 2900 average. Of course that was on a different day conditions etc. My load is 51.9 grs of 4831sc lapua brass around 20 thou off the lands. My barrel is a 26" Brux 8 twist.

    I know this powder is not very temp sensative but how much velocity change can I expect going from say 105 degrees to 85 and all the way to 30 degrees Fahrenheit?

    Thanks
     
  8. Greyfox

    Greyfox Well-Known Member

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    I don't know what the velocity difference is but I have found that under 500 yards my impact for hunting is negligible. One click downward for each 25 degrees colder out to 700, 2 for each 25 between 700 and 1000. My clicks are .33moa. This works is for me with my turrets.