fwiw, I have a 19-4 that, when I got it many years ago, would not chamber any .357 cartridge I could find. They stopped about 1/10" from seating in the recessed cylinder. Otherwise the gun is a standard 19-4, 4", marked .357 cal. I had a gunsmith with the correct reamers cut the cylinder to accept .357. I've fired it a little over the years withour problems, but it's such a pretty example I tend to leave it in the safe. Probably just an error at the factory.