There are so many more factors that start coming into play than just speed and weight, all bullets are going to drop at a different rate and react to wind differently depending on the bullets construction. The ballistic coefficient has a tremendous amount to do with it, higher the bc the flatter trajectories you will achieve. That is one reason the 6.5 is so popular in long range shooting. Really long slick bullets slip through the air really easily and buck the wind so you don't have to compensate nearly as much.
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x2...
Isnt that what i said? guess i should have elaborated.

flatter trajectory means faster bullets...faster bullets mean more or better gun powder, better co-efficiency, just better bullet design...