-A drag curve is essentially a graph of a projectiles velocity with respect to its coefficient of drag, which helps calculate its negative acceleration due to the effects of the atmosphere at the speed by which it is traveling. The drag curve then is used to calculate the trajectory which determines elevation settings.

- A drag coefficient as it applies to shooting is a number used to quantify the drag or resistance of a bullet as it travels through the air. And because of modern technology like Doppler radar, we wouldn't need a ballistic coefficient because we can find the coefficient of drag as velocity decreases which generates a drag curve. However due to lack of technology and testing capabilities, the use of a ballistic coefficient is used to compare a bullet to a standard bullet.

-A form factor is comparing a bullets (shape) to a standard bullet. It is a ratio of the coefficients of drag. The form factor is also used to scale the standard bullet's drag curve to model the bullet being tested.

-A ballistic coefficient is a combination of sectional density and form factor, which makes sense because you are comparing two shapes and how well they penetrate the air, but you have to factor in the size of the bullet. The BC changes with velocity because the coefficient of drag changes with speed, which changes the form factor, which changes the BC.

My question is and maybe I'm missing something, but if the form factor is used to scale the drag curve of the standard bullet to model the bullet being tested, how does the BC alter the standard's bullet drag curve? Does it scale the curve similar to the form factor?

The image is a picture from Bryan Litz's book Applied Ballistics for Long-Range Shooting, explaining how the form factor is used to scale drag curves.