Yes Benjamin, just an empty chamber!
Jesse the last one I saw...yes saw! Happened in Aurora Colorado at the Aurora P.D. training center in the middle 90s. They had a star reloader and had made a bunch of 9mm "dummy" rounds with a case, spent priimer and a new bullet crimped in. They were goin over imediate action drills....Tap rack bang, and had the students in 3 rows in the class room, one behind the other. On the forth evolution there was a real bang and one of the Female cadets was shot right in the back of the head and died before she hit the ground. The "dummy" bullet exited her head and almost struck the lead instructor at the front of the class.
Somehow a live round had found it's way off the range and into the "dummy" round supply, it looked just like the rest except for the dent in the primier, and the NEW to firearm student didn't know what he was looking at! I don't like any dummy round that looks like REAL ammo!
Yeah there were lots of problems with what they were doing and how they were doing it, imagine in ROWS, and I was there observing the training with an eye on helping change their firearms program and had already remarked that what they were doing just wasn't safe, but I had been assured that these were "dummy rounds"! KurtM