Ok, I fiddled around long enough and got a round to do that (actually, a snap cap, but y'know). If you chamber a round in my 1911, pull the slide back VERY slowly so that the ejector doesn't knock it out, and then drop the magazine while letting the slide forward quickly, you can get it to flip over. It sorta falls down the mag well, and then gets caught by the slide and pushed in backward. I also had good results with keeping the magazine in, pulling the slide back real slow so that the round doesn't actually eject, and then shaking the pistol real hard. I don't recommend trying this with live rounds, as you may tear up a perfectly good cartridge.