close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics

Reply

Actual vs. published bc

LinkBack Thread Tools Display Modes
  #1  
Unread 05-17-2013, 02:04 PM
Junior Member
 
Join Date: Mar 2012
Posts: 2
Actual vs. published bc

What is the best/easiest way to determine actual bc of a given bullet without being an engineer or mathematician?
Reply With Quote
  •   #2  
    Unread 05-17-2013, 03:20 PM
    Junior Member
     
    Join Date: Dec 2011
    Location: Mid Missouri
    Posts: 20
    Re: Actual vs. published bc

    Most of the time I just use what the mfr. publishes. Usually they're close enough.
    If you want to get more in depth, this site can help.
    all about bullets
    __________________
    "The nine most terrifying words in the English language are,
    'I'm from the government and I'm here to help.'"
    - Ronald Reagan
    Reply With Quote

      #3  
    Unread 05-18-2013, 06:58 PM
    Platinum Member
     
    Join Date: Aug 2003
    Location: NC, oceanfront
    Posts: 4,021
    Re: Actual vs. published bc

    Quote:
    Originally Posted by Rbreb13 View Post
    If you want to get more in depth, this site can help.
    That's an article about greenhill TWIST calcs, and not BC..
    There is no 'easy' way to determine -actual- BC. Your best bet is to use BC data from Bryan Litz's book: AB for Long Range Shooting
    And learn to use the latest in ballistic software in conjunction.
    Reply With Quote
      #4  
    Unread 05-18-2013, 08:42 PM
    Platinum Member
     
    Join Date: Dec 2011
    Location: Michigan
    Posts: 1,121
    Re: Actual vs. published bc

    Quote:
    Originally Posted by Mikecr View Post
    That's an article about greenhill TWIST calcs, and not BC..
    There is no 'easy' way to determine -actual- BC. Your best bet is to use BC data from Bryan Litz's book: AB for Long Range Shooting
    And learn to use the latest in ballistic software in conjunction.
    What software do you run?
    Reply With Quote
      #5  
    Unread 05-19-2013, 06:40 AM
    Gold Member
     
    Join Date: Mar 2004
    Location: Las Vegas, NV
    Posts: 610
    Re: Actual vs. published bc

    most of the recently published BCs are fairly accurate; prior to the last few years the Bcs on lots of bullets were heavily inflated. Sierra being the only real exception - since they have always released banded BC tired to velocity. Many ballistic software manfacturers had now fully integrated the newer bc numbers.

    I know the Bcs in my android app (shooter) are pretty good, out to about 1,500 yards. After that, they numbers are still too high and you need to do your own banded velocity inputs. My brother uses Field Firing Solutions, and its pretty good out to a mile (1,760) and it lets you modify the inputs to reflect actual results.

    The site JBM Ballastics has a good calulator that includes pretty good bc.

    Jeffvn
    Reply With Quote
      #6  
    Unread 05-19-2013, 08:51 AM
    Platinum Member
     
    Join Date: May 2008
    Location: South of Canada and North of Wyoming
    Posts: 6,068
    Re: Actual vs. published bc

    I think you will find Bryan Litz' BC's to be very accurate. I use his. But if he hasn't calculated one for a particular bullet, I use the manufacturer's BC as a starting place. Then I shoot the bullets and confirm drops at different ranges. Then I fudge the velocity and BC to get the closest curve for my load and rifle. To do this right, your info must accurate. Scope height, accurate zero, accurate groups and interpretation, accurate environmental conditions and the farther you test your drops, the better.
    __________________
    - Mark

    You will never know how much it has cost my generation to preserve your freedom. I hope you make good use of it.
    ~ John Quincy Adams
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes



    All times are GMT -5. The time now is 03:14 AM.


    Powered by vBulletin ©2000 - 2016, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC