A .38 Special has a lower chamber pressure, which creates less stress on the frame, barrel and action vs. a .357 Mag. One thing I would not do is fire .38 Special lead bullets and then firing .38 Special jacketed bullets or .357 Mag bullets (jacketed or hard cast) without first doing a good thorough cleaning to remove the lead in the barrel. Firing a jacketed or hard cast bullet after a soft lead bullet without first doing a thorough cleaning of the barrel will make it harder to remove the lead fouling from the barrel.
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