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If my memory is correct the original 357 loading by winchester was a lead 158 gr lead bullet. I think I still have a partial box around somewhere.
After shooting a couple of cylinders of this load, original HI pressure load, you needed to spend a bunch of time cleaning the lead our of the barrel. The bullet needs to be hard to withstand 35,000 cup pressure. This is not what was originally loaded as they wanted the bullet to expand.
Jacketed bullets were the way to get soft lead, and no barrel leading in the 357. You can use minimal copper, a Gas Check to help control the leading. Or go to harder lead bullets and get no leading / no expansion.
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