The Hornady should expand at 850-900fps, easily done in 357mag cases & no leading. For practice loads you can use any cast 158gr lswc. I dont andload SDammo,but tje fbi loaded by Rem, Win Or Fed, if you can find them, run about 875fps in my m66 snub. If you are getting leading, check cyl throat dia.

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NRA Cert. Inst. IDPA CSO