Interesting, though mostly uneducational thread. If one is restricted to the use of factory ammo, then overuse of factory 125gr. JHP loads can accelerate wear in any .357 K-frame. Known fact. As to it being a matter of "light bullets," BS, and as to the idea that a small number of hot factory 125gr. loads can be a problem, the BS factor is even higher. Factory loadings of 110 gr. bullets are a non-issue, because they are loaded so light. It is ONLY the factory 125gr. screamers that are an issue at all. I tend to baby my K-frames more than I likely should, just because replacement parts and repairs are a problem. Will a reasonable number of hot 125gr. factory loads ruin or excessively wear a .357 K-frame? Hell, no! This subject is tee-totally worn out. If you have a nice K-frame magnum, don't fear that it will explode if you shoot a few hot, factory 125gr. JHP loads. If you want your K-frame maggie to last a long time, then limit your use of magnum ammo, REGARDLESS of bullet weight. The forcing cone issues are a bigger problem with 125gr.bullets, but insofar as overall wear to the gun, full-power 158gr. loads will beat it up just as much, if not more.