Question about bullet drag function settings?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Fiftydriver, Aug 3, 2003.

  1. Fiftydriver

    Fiftydriver <strong>Official LRH Sponsor</strong>

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    To all,

    I was just playing around with some numbers on my ballistic program and was wondering what do the different drag functions represent?

    The program lists the fallowing as choices:
    G1
    G2
    G5
    G6
    G7
    G8
    GL
    GI

    What do these different functions represent. I assume they are scales for different types of bullet designs but do not know for sure.

    I am most interested in which one to use for VLD types of bullets.

    Thanks for the time and information!!!

    Good Shooting!!!

    50

    [ 08-04-2003: Message edited by: Fiftydriver ]
     
  2. 700

    700 Well-Known Member

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  3. MAX

    MAX Well-Known Member

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    Your assumption is essentially correct, the higher "G" numbers representing lower drag form standards for comparison.

    The link above offers a decent explanation. "VLD" is a term not a specific design. Any data you derive from the Ballistics Programs with inserted 'G' values will be an approximation(perhaps close) that will need verification at the range.
     
  4. JackRabbitSquare

    JackRabbitSquare Well-Known Member

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    After reading the site that 700 posted it looks like g5 or g7 would be what you would use for the 300gr MK. I ran the calculations and they seem way high. I understand that any chart will have to be customized but would the g5 drag function be closer to the bullets performance then say g1 which seems more reasonable?

    ** nevermind after reading around on the sierra site I found the info I needed **

    [ 08-06-2003: Message edited by: Pennell ]
     
  5. MAX

    MAX Well-Known Member

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  6. squirrelsniper

    squirrelsniper New Member

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    MAX, try this link to JBM - JBM
     
  7. MAX

    MAX Well-Known Member

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    Thanks, appreciate that. Was cybermesa, now eskimos? [​IMG] Love that site, hadn't been there recently.