Ok shooters, if you don't know what it is/does, google it, answer the question and learn something today. Be honest and say if you knew what it is/does or if you had to google it. Also, do you take guys/girls out to shoot for a date?
It is a made-up number to make it easier to scale bullets of different sizes. If I remember correction, it is proportional to the mass and inversely proportional to the drag coefficient. It is a collection of terms in the equation of motion.
For long distance shooting, the drop due to gravity matters. The bullet has a muzzle velocity, but also is slowing down due to drag. The more drag, the faster it slows down and the bigger the drop over a given distance for a given muzzle velocity. Since the Ballistic Coefficient contains both the mass and the drag coefficient for the bullet shape, you can calculate that drop or merely look it up on a chart.
Yes, I take girls out to shoot for a date. We have a long talk about safety first and I have them start with a.22LR, either handgun or rifle until the get the hang of it. I would never start them with a.45, 12ga pump, or.30-30. That would not be prudent.
I did not know, i read the definition, and understood, i presume it's based on cross section, aerodynamic drag and mass.
I've shot a 22 rifle a long time ago. Some of my wife's family hunt, my daughter has gone to a range with my wife's cousin. Hunting/shooting rifles is not a big thing here in big cities.
And the whole guns for self defense thing, we really don't have. At what point one of my extended family was living in my basement, had a bunch of guns but they literally all are unloaded and in lockers. People have guns here to hunt, and that's it really.