The problem here is BC doesn't kill <blather>
No, it determines wind deflection and retained velocity which are both critical to A) how far one can shoot accurately in unknown wind and B) what bullet terminal performance looks like when it gets there
Accurate shots and terminal performance are what kill. So while BC doesn't directly kill, it determines both things that do.
The difference between a .270 and a superior cartridge is obvious to any competent western hunter.
