Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Determine ballistic coefficient of projectile?

Discussion in 'Handloading and Reloading' started by cpileri, Dec 9, 2010.

Thread Status:
Not open for further replies.
  1. cpileri

    cpileri Member

    Joined:
    Dec 24, 2002
    Messages:
    1,422
    Is there an online program, or a real-live person who specializes in such things; who can determine the ballistic Coefficient of a bullet if its shape, size, weight, composition, and all dimensions are known?

    Can anyone point me to the correct link or person?

    Sincerely,
    C-
     
  2. Ol` Joe

    Ol` Joe Member

    Joined:
    Feb 25, 2004
    Messages:
    2,087
    Location:
    michigan
    Call Sierra and talk to one of their Techs. I`m sure he can point you to the formula or tell you how the factory goes about figuring theirs.
     
  3. rg1

    rg1 Member

    Joined:
    May 26, 2006
    Messages:
    1,217
    Location:
    Kentucky
    Only way to find out for sure for an unknown bullet is to use two chronographs, one at the muzzle and another downrange at a specific distance. By taking chrono readings of velocity at the muzzle and downrange you can compute BC's. Don't have the formula and you'd need to be pretty accurate to not hit the chronograph downrange. Now if you have a bullet from a known manufacturer, they can usually give you BC's ranges for your bullet.
     
  4. Zak Smith

    Zak Smith Moderator Emeritus

    Joined:
    Dec 24, 2002
    Messages:
    9,037
    Location:
    Fort Collins, CO, USA.
    There are two books that touch on it: Rinker's basic ballistic books, and McCoy's tome on external ballistics. The new Litz book might cover it as well. There are computational "rules of thumb" that work for certain geometries; however, as rg1 posted, the way to get true real life BC values is to use radar or chronographs.
     
  5. rg1

    rg1 Member

    Joined:
    May 26, 2006
    Messages:
    1,217
    Location:
    Kentucky
    A simple but very good ballistic program is PointBlank Ballistics with a free download from here: http://huntingnut.com/index.php?name=PointBlank
    The program has a bc calculator but you still have to have muzzle velocity and 100 yard velocity for your bullet. Click on Misc Functions for the bc calculator and other functions. A very interesting program and free from HuntingNut. It downloads to a file that I store in my documents folder. Click on the Scope Crosshair file to start the program.
     
  6. JimKirk

    JimKirk Member

    Joined:
    Nov 23, 2008
    Messages:
    2,844
    Location:
    Nicholls,GA South Georgia
  7. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    Every bullet manufactures reloading manual shows the SD & BC for every bullet they sell.

    rc
     
Thread Status:
Not open for further replies.

Share This Page