From what I've read pon the subject, no personal experience with the things, original 357 magnum loads were quite hot, to hot for the lead bullets used at the time, leading was terrible.
This led to a reduction in velocity, which helped, though the use of jacketed or at least partially jacketed bullets fixed the leading problem.
The "K" frame guns chambered for the 357 will not stand up to continuous use of full power factory loads, or handloaded equivalent. They weren't designed for that sort of service, as I understood the thing.
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