So, a baseball and a same sized nerf ball have the same B/C? It sure seems like a baseball thrown at the same velocity has a much higher B/C, as it keeps its speed much longer and generally goes further. Drag coefficient I can see based solely on bullet profile, but not the actual ballistic coefficient. Apparently velocity also plays a factor and B/C can change with velocity, which gets me doubly confused.
I am totally lost here...
Well, yes and no.
The number we call BC is a comparison between the aerodynamic of a given bullet and a reference projectile, typically the 1" Krupps shell from WWI. At different velocities projectiles will have different relative performance to the reference projectile and hence a variable BC. Some bullet manufactures such as Sierra will give you a Bullets BC at a specified velocity, and this is why.
