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Calculation of B.C.

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Unread 07-17-2003, 09:20 AM
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Join Date: Feb 2003
Location: Pueblo, CO
Posts: 1,244
Calculation of B.C.

I've seen numerous posts here about the B.C. being calculated/verified by shooting. How is this done? I'm assuming it has something to do with m.v./downrange bullet impact relative to line of sight. Right??
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Unread 07-17-2003, 09:38 AM
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Join Date: May 2001
Location: Pennsylvania
Posts: 1,757
Re: Calculation of B.C.


It's actual fire at known ranges to get the clicks or MOA needed to put the bullet that is being used as the test bullet, on target.

We check the computer drop charts as to what it calls for, using "THAT" bullet to see where this actual fire falls in place.

If a certain manufacurer says a bullet has a BC of whatever, and you run the ballistics and find that it will need say 20 MOA to get to 1000 yards and the bullet gets there from a 100 yard zero with "less" MOA, then the BC is probably better then listed.
The reverse is true also if it takes more MOA to get to the same range.

Darryl Cassel
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Unread 07-17-2003, 09:54 AM
Oli Oli is offline
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Join Date: May 2003
Posts: 10
Re: Calculation of B.C.

You use two chronographs some distance apart from each other and compare the difference in velocity. I dont know of any english versions so try this swedish one: http://www.robsoft.nu/ballistik_se/bc.asp?MainID=3

velocity at first chrono (m/s)
velocity at second chrono (m/s)
bullet weight (g)
Altitude (m above sea level)
Temp. (C)
Distance between chronographs (m)

Press "räkna"
BC appears in red

[ 07-17-2003: Message edited by: Oli ]
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