I have seen 1, S&W 19 with cone cracked. No idea of round count
gun was PD trade in. However I have seen many other 357s with
cracked cones and I know they weren't hi count guns. All them
had been firing light bullet/ mag loads. This seems to occur more
in the bargan DAs.off brands. The single action guns don't seem
to suffer this. Ruger Blackhawks are cranked out with 110s and
I have never seen a cracked cone. Some bad throat erosion but
no cracks. I have seen cylinders blown and top strap warped, but
no cone damage. These guns have hi count with hot loads, owners are shooting a couple boxes a week at steel silos.