Yesterday I was at the range giving my G22 a workout. The Sheriff makes me carry it, and it will soon be time for quals, so I decided it was time to exercise all the springs. During one of the magazines, I had a failure-to-fire. Being the highly trained individual I am, I immediately did the tap/rack/bang. After the string, I looked for the dud cartridge, and looky what I found.
That's a 9mm round, with a GFL headstamp. The Glock 22 is, of course, a .40SW, and I don't even own a 9mm handgun. Nor a 9mm anything. The ammo I was using was an opened box of Winchester White Box, .40SW 165 grain ball ammo. I doubt that Winchester put that round of ammo in the box, so its provenance is a bit of a mystery.
So, again, in the interest of safety, let's be careful about the ammo we load in our firearms.