Ballistic coefficient
When hunting with a rifle, a higher BC is good for several reasons.  A higher BC results in a flatter flight. The effect of mistakes in estimating the distance to the target is smaller for  bullet with a higher BC.  This is important when attempting an effective hit on a game animal.  If the target animal is closer than estimated, then the bullet will hit higher than expected.  On the other hand, if the animal is further than estimated the bullet will hit lower than expected.  Such a difference in bullet drop can make the difference between a clean kill and a wounded animal.