In an older "Rifles Handloader" Gil Sengel had an article about loading original .38 special and shooting it in a pair of 1905 S&W's.He stated that he cast his bullets to a hardness of 6-7 Brinnell and suggested that hard cast bullets could be the cause of these revolvers breaking while loading fast burning powders.
You guys that actually load for and shoot your older K frames just what do you use and why?
I know about the heat treated guns and I would never use jacketed in my old revolvers but if you shoot yours frequently what do you think of Mr. Sengel's assessment?