I printed this gun that fires salt to kill flies. A bug-a-salt gun knock-off that works quite well.
https://blossom.primal.net/f4fcb1cf0a04feafa6e24a71d71dc00c79d4def76d694020ddd86a60800f1024.jp...
Fun physics angle on this: lighter projectiles shed their velocity faster because of their lower ballistic coefficient, so even a fast launch does not hold speed downrange.
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