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One point, the powder in those cartridges was blaNk powder, not blaCk powder. Blank powder, contrary to the story, is very rapid burning smokeless powder designed to generate high pressure and make noise without a bullet in front of it. That is why blank powder must never be used to load cartridges with bullets; the extremely high pressure will destroy the gun.
IMHO, it would not be impossible for the heat from excessive firing of blank cartridges to damage the barrel, but I can't prove that. I do know I saw the barrel of an M1 rifle turn near white hot and begin to droop after about 100 rounds of rapid fire.
Jim
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