If you've spent any time browsing ammunition boxes or reloading manuals, you've probably noticed a small number listed next to each bullet — something like .450 or .245 — labeled "BC." That number is the ballistic coefficient, and it plays a bigger role in your shooting accuracy than most people realize. Whether you're a long-range hunter, a competitive shooter, or just getting into precision rifles, understanding ballistic coefficient will help you make smarter choices about ammo an …