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true bullet coefficient

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  #1  
Unread 08-09-2009, 12:33 AM
mo mo is offline
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true bullet coefficient

I think I read somewhere that if you get muzzle velocity and then get your velocity from a 100 yd. you can get your true bullet coefficient. Is that correct? Does anyone know that formula?
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  •   #2  
    Unread 08-09-2009, 01:49 AM
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    Re: true bullet coefficient

    Not real practical. Too many errors on such a short distance.

    You have a very short time of flight and the accuracy of your chronograph to think about that may be a few%.

    If you are interested in such things, buy Bryan Litz book.
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    Unread 08-09-2009, 12:06 PM
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    Re: true bullet coefficient

    Quote:
    Originally Posted by mo View Post
    I think I read somewhere that if you get muzzle velocity and then get your velocity from a 100 yd. you can get your true bullet coefficient. Is that correct? Does anyone know that formula?

    You need to spread the two readings out over a longer distance. The farther apart the more accurate you will be in figuring your BC.

    Here is a link to Jbm calcuations page that will help you.

    http://www.jbmballistics.com/calcula...culations.html
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      #4  
    Unread 08-09-2009, 12:21 PM
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    Re: true bullet coefficient

    Brian Litz's book is excellent,easy to understand and not too technical.
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      #5  
    Unread 08-09-2009, 06:31 PM
    mo mo is offline
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    Re: true bullet coefficient

    thanks gentlemen.
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      #6  
    Unread 08-11-2009, 03:41 PM
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    Re: true bullet coefficient

    2 chronies work fine for a good place to start. The only thing you cant get is a drag model but will give you a DANG good place to start. 3 different times this year with 3 different loads I used the double chrony method to come up with a BC and put first round hits in the X ring at 700 yards.

    My chronies are 300 yards apart. As far as caluclations, it is best to use a ballistic calculator.
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      #7  
    Unread 08-11-2009, 07:45 PM
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    Re: true bullet coefficient

    You should also check this thread and article out.

    Berger Bullets' Move To The G7 Standard BC By Bryan Litz

    Very, very informative.

    -MR
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