Swapping out barrels on a pair of S&W Model 64-6's. I've heard that running the light weight 357 magnum loads were hard on the K frame forcing cones. It looks like it's not much better running the light weight 38 spl +P's. These were a couple of police trade ins that have seen plenty of range time with +P ammunition. Both forcing cones have quite a bit of erosion, not to mention both being cracked.
I have a few high round count Model 19's 64's & 66's that have nowhere near the ware these two revolvers show. But then again I stick with 158 grain bullets and don't try to hot rod them.