Originally Posted by Pekin7
In my Hornady reloading manual, it lists a bullet metric labeled as "B.C." What does that measurement mean?
Back to the original intent of the question.
'B.C." is short for Ballistic Coefficient.
Think of the projectile being a tire and the air as a roadway.
A higher "B.C." would be the equivalency of a harder and or smoother road surface. A tire will role farther and easier on smooth pavement than on/in soft sand or loose gravel.
This analogy is correct only in the common effects.
With bullets, the shape of the nose and heal with the amount of mass (weight) enclosed in the air foil disruption caused by the motion of the bullet (at its present speed and that changes) are used to give the coefficient number. Closer to '1', the less loss of energy/velocity of the projectile due to the effects of the bullet's design.
Short range uses, Pistols, shot guns and the like, are effected by B.C. but the ranges are comparatively so short as to not be much of a factor.
Longer range uses and the B.C. becomes much more apparent.
I seldom get to shoot much more than a hundred yards (trees and brush), so I seldom worry with B.C.. Yes the effects are their, but I am more of a factor.
Hope this helped a little.