In what part of the animals death does BC contribute?
The part where the bullet ends up where it's supposed to more often (due to less drift)... and the part where more work is done on critter clockwork (due to greater retained energy). More BC is never a bad thing.... ever.... given adequate projectile integrity.
Not sure if you could find more ass and less drift at 500 yds, for a mere 40 grains of powder, than a 7/08 flinging 162s @ 2600+
