I think you have plain old Clays. I couln't find any Clays Extra Clean on Hodgdon's website, so I went and looked at my Clays...it does say Extra Clean Shotgun-Handgun Powder on the label. Just to make sure, the code on the UPC scan bar is 39288 53121. If your's matches...you should have plain old regular Clays...NOT Clays Universal, which is a different powder.
The Hornady manual lists loads for 357 with lead bullets and Clays powder.
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