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It ruined a barrel in my Glock 23. An "assistant instructor" at a course told my friend (who was using my 23 in the class) to shoot a cartridge the "assistant instructor" picked up and placed in the chamber. Barrel has a bulge and locked up the gun.And I can testify to the fact shooting 9mm in a .40 S&W isn't going to hurt you!
At least I don't see how it could hurt you, or the gun for that matter. All it does is unevenly balloon out the case, and not cycle. The bullet tumbled into the target about a foot low. ?YMMV.
Edit: Something I hadn't considered has been brought up below. It CAN lead to some pretty hairy consequences if a person isn't paying close attention.