[/QUOTE]
Those diminishing velocities made me think it would take a whole lot more powder to get one to 3,000 fps, more than would have time to burn in the barrel.[/QUOTE]
A professor of applied physics could probably take that document that I linked to, and a given bore size and projectile weight and be able to make a pretty close calculation. I barely passed Applied Physics 101, so I am not your guy for that answer.