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# true bullet coefficient

#1
08-09-2009, 01:33 AM
 Silver Member Join Date: Mar 2006 Location: mississippi Posts: 431
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?
#2
08-09-2009, 02:49 AM
 Platinum Member Join Date: Nov 2008 Posts: 1,026
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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#3
08-09-2009, 01:06 PM
 Platinum Member Join Date: Mar 2007 Location: MN Posts: 1,218
Re: true bullet coefficient

Quote:
 Originally Posted by mo 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.

http://www.jbmballistics.com/calcula...culations.html
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#4
08-09-2009, 01:21 PM
 Junior Member Join Date: Jul 2009 Posts: 13
Re: true bullet coefficient

Brian Litz's book is excellent,easy to understand and not too technical.
#5
08-09-2009, 07:31 PM
 Silver Member Join Date: Mar 2006 Location: mississippi Posts: 431
Re: true bullet coefficient

thanks gentlemen.
#6
08-11-2009, 04:41 PM
 Platinum Member Join Date: Jan 2003 Location: The rifle range, or archery range or behind the computer in Alaska Posts: 3,290
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
08-11-2009, 08:45 PM
 Platinum Member Join Date: May 2008 Location: South of Canada and North of Wyoming Posts: 5,474
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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