I was at the gun club earlier this week lighting off some 9mm's. Second to the last round in the magazine, blew pessure and powder in my face, barked oddly, recoil was different, more smoke than usual and jammed the slide. After removing the magazine and getting the slide back, I could see the fired case was turned around 180° and pushed a ways into the chamber. I removed the case, and saw where the case had blown out in the unsupported section of the chamber. The last round was pointing straight up still in the magazine. The case, Winchester, looked good, except for the blow out. Don't know the issue, unless it was a tired case, or ???? If not for my safety glasses, I would have surely wound up with debris in my eye/eyes. It definately pays to be safe.
I had implants in my eyes a couple years ago. The implants were such that I could shoot a handgun with no glasses and see the sights. After the implants, if I wore my prescription glasses, the sights were blurry. So, I went down to COSTCO, and had a pair of glasses with polycarbonate lenses with no prescription at all. They work great. Let's be careful out there. We only have one pair of eyes.