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https://www.khm.at/en/objectdb/detail/87073/
Check out this neat little curiousity in action here:
https://www.youtube.com/watch?v=14y_7yNEnG8&t=55s&ab_channel=KunsthistorischesMuseumWien
deleted by creator
I think it just makes noise, sets off some gunpowder without any projectile loaded.