Took the Glock 19 to the range today for the first time since I got it back from the grip reduction. On the first mag about halfwalf through I had a malfunction where the slide caught the brass backwards as it was ejecting. Well I just racked the slide to clear it and chamber a new round not thinking anything of it. Then went on to firing several mags without any problems, till I was loading a mag and noticed a .380 round in my hand that I was about to load in the mag. Well, that got me thinking and I started looking at the brass (I was picking it up as I shot) and noticed that the malfunctioned round was infact a .380 that I had fired. It was a box of about 400 reloaded 9mm that I had somehow gonna about 6 .380s in it. Guess I should have known something was up from the moment my G19 malfunctioned though.