I have a S&W Mod. 60 J-Frame chambered for .357 magnum. There are no limitations whatever specified for load use with this gun.
The K-Frame is heavier than the magnum J-Frame by perhaps 25%. I've never read any load limitations being specified for the K-Frame.
We've recently loaded .38 Spec considerably past maximum .357 magnum pressures and fired these in aluminum frame, lightweight, and break-top revolvers without damage.
Someone please explain why the K-Frame will not manage maximum .357 magnum loads. S&W developed the .357 magnum, and developed the firearms chambered for this caliber. I've never read of load limitations anywhere for the K-Frame. I think it's "folklore" to put it politely. Don't you think Smith & Wesson knows what they're doing?
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