Mark - you know I thought about this last night, while sipping on a glass of very old Scottish whiskey. Started playing the devil's advocate against my own logic . . . . .

Suppose is I go out to my lathe and produce a rifle bullet made out of aluminum - to the exact shape and diameter of a .30 caliber 220 grain Sierra Matchking. Let's say it only weighs 125 grains. And I also produce an identical shaped bullet out of machineable tungsten - and this bullet weighs 290 grains. Both bullets have exactly the same ballistic coefficient, right? If they were launched at exactly the same velocity, I can't see any way the aluminum bullet is going to fly as far as the tungsten bullet. Kinda like steel shot opposed to lead shot. But if I plug the numbers into my Exbal or Infinity program, they come out the same. Now I'm kinda confused . . . .