It saddens me that even on here there are people who want to see their friends injured. Use only 380 ACP or 380 AUTO, as other "okay" box designations like 9mm Corto are rare enough around here that "box content substitutions" might have happened. It is possible that since you are surrounded by FELON saboteurs, you should also check the case markings! The 9mm Parabellum (Luger) is a bit longer and both shells headspace on the casemouth, so it would take some criminal rechambering your gun to be able to chamber and fire 9mm ammo, but in your case you might have strange enough associates for that to have happened! If it occurred, probably the extractor would hold onto proper 380 Auto shells well enough that the firing pin can fire the primer, so you might not have any clue someone had set you up. IF an EMPTY 9mm case will chamber in your gun, then somebody has set you up this way for a disaster, as the 9mm runs at 35,000 psi and the 380 ACP runs at only 21,500 psi.