So, I've seen several references to a bullet's ballistic coefficient changing if it is moving above X velocity, below Y velocity or between X and Y velocity, etc. The Sierra website is a prime example of this but I have seen it elsewhere as well.
I thought ballistic coefficient was simply how aerodynamic a bullet is...how well it moves air out of the way as it speeds through. It is a function of weight, shape, ogive, meplat dimensions, boattail design, etc. right? I don't see how all those factors change at different speeds.
A given bullet's flight path certainly will change with speed...as in a faster bullet flies flatter and a blunt bullet sheds velocity faster than a VLD type bullet, but how does velocity alone change a ballistic coefficient?
Can anyone explain this for a relative newbie?
