[Stewart]

The reason that small increses in MV/BC are so much more effective is not because of the differances between target and projectile velocities as you surmise, but because you required less lead on a target apearantly moving accross the line of fire.

The USAF made many studdies and determined that the third power of the differance between any two MVs would show the differance in probability to hit. In WW-II the Germans determined that the square of the differances in MV was equal to the differance in hit probability. The Ruskis came to much the same conclusions, but then determined that weight of shell Vs the heavy American Bombers was more inportant as they were very easy to hit. later guns had much higher MV/BCs!