I was thinking of a field modification: what do you do when the cannonball is too big for your cannon, and you really need to fire that projectile? "You men, take these hammers and chisels....followed hours later by colorful invectives and a "that didn't work!" Then you leave your failure on the battlefield, to mess with the minds of those who come after you.
Anyway, I was reading a little about hot shot, and the one thing I'm pretty sure about is that they weren't heating the balls enough to deform them. It's hard to do that without a formed air draft and a much hotter fire than they describe.
Best,
F
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