Thanks mike,
However, I'm still not getting anything related to the flight characteristics of 2 different bullets made of materials with differing densities.
Here's a scenario that might help understand the question. Let's assume that we have 2 bullets. One made of lead, one made of copper. They are formed in the same mold, loaded in the same rifle and shot at the same speed. What is the difference? Surely there is something, beyond what a calculator using BC and velocity tells us.