I guess one thing that should be explained is that weight alone plays no role in bullet drop. BC and velocity are all that are needed to calculate drop. Weight does become a factor, however, when calculating wind deflection....along with BC and velocity.

A 140 grain bullet with a .4 BC will exprience identical drop to a 200 grain bullet with a .4 BC providing they leave the muzzle at the same velocity. How they are affected by wind will vary, however, with the 200 grain bullet experiencing less deviation. Drop is a simple calculation.....wind is more complex.