Dan;
A postscript.
After WWI the army used a railroad gun at Aberdeen to test the fusing of aerial bombs. They'd put the bomb in a sabot and shoot it horizontally at a solid target. A charge of BP in the railroad gun gave the bomb the same terminal velocity as it would have achieved if they'd dropped it from an airplane, with much less expense, greater accuracy on target, and a faster turn around time between tests.
Dick
