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Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Balistc Coefficiant

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Unread 05-21-2006, 02:03 AM
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Join Date: Jan 2006
Location: Mississippi
Posts: 147
Balistc Coefficiant

I understand that the bullet with the highest BC will when the race with a faster bullet of lower BC.
My question is what is the equation to calculate at what distance the high BC bullet catches the one with a lower BC.

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Unread 05-21-2006, 04:48 AM
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Join Date: Dec 2005
Posts: 2,483
Re: Balistc Coefficiant

Sierra Bullets' reloading manuals have been packed with all sorts of ballistic equations, formulas and stuff of that nature. Plus their explanations help folks like me understand the relative things that determine a bullet's BC.

My guess is the easiest way to find out at what point does one bullet overtake another is to run ballistic software (Sierras'?) then compare two bullets' time of flight. At the range where their time of flights are the same is where the higher BC one overtakes the lower BC one.

Someone else may have a better suggestion, but such is life.
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Unread 05-22-2006, 01:25 PM
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Join Date: Nov 2004
Posts: 877
Re: Balistc Coefficiant

Unfortunately barts right. Theres no quick and dirty method that will do it. If you are talking about 2 bullets launched from the same cartridge, generally, if both bullets are of equal design, and the BC commensurates with the weight increase, the heavier bullet will always have less drift, and the lighter will have a flatter trajectory. It won't usually be a radical differance, but thats the way it usually shakes out. Occasionally, like in the case of the 308WIN, the heaviest bullets can't gain enough speed in normal length barrels to make up for the increase in weight. Also, the heavier bullet will eventually win out in the drop area as well over the light one if you look at a long enough range... but even then not by much, and were talking 1500yds and better. I shoot 220SMKs out of my 300WM, and im liking 180Bergers from my 7mm esty dubbaya, so to me, the better wind drift of the heavier bullets is worth the small increase in max height at shorter ranges... but part of it is a personal choice. If youve got a cartridge and bullets in mind, I could give you some specific numbers.
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Unread 05-22-2006, 08:17 PM
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Join Date: Feb 2005
Location: Nevada
Posts: 2,782
Re: Balistc Coefficiant

Ballistic Explorer can help!

<font color="red">BC = 0.197 MV = 3770 </font> VS <font color="green">BC = 0.483 MV = 2600 </font>


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