Ballistic Coefficient
The Ballistic Coefficient or "BC" of a bullet reflects the total drag drag factor of the bullet - how fast it slows down. This used to be a calculated number based on shape and weight, but now it is the result of measuring the actual velocity drop over distance. The BC is also corrected in your PACT Professional Chronograph and PACT Championship Timer for altitude and temperature. The BC is what drives the Ballistic Computer which help you achieve the perfect zero and build a drop table for your load/gun combination.