how to

[calib]

how do you figure out the correct bc of a cartridge? i mean i have the bullet bc, but how do i find out what my bc is with my muzzle velocity of my load?

[KRP]

The cartridge doesn't affect bc. You could do the math and come up with a theoretical number for the bullet, the manufacturer has done this for you already though. Multiple chronographs in series is probably your best bet to calculate bc for you specific conditions.

[gotcha]

Calib, I'm not a ballistician, mathematician or mortician. ;D But, B.C.'s do vary w/ velocity as you indicated & according to Sierras web site. I just googled ( ballistic coefficient calculator) & came up w/ several on line programs to give you the answers you seek. Berger also has a quick & simple on line bullet drop chart calculator that requires a B.C. to plug in, as well as, other necessary data. Hope this info is helpful, Dale

[helotaxi]

Brian Litz discusses the issue of ballistic coefficient at length in his book Applied Ballistics for Long Range Shooting. Definitely worth a read if you're interested that type of thing. Best part is that it includes very capable ballistics software and contains a section of tested ballistic coefficients for more than 175 different bullets.