Both powders will do well in moderate loads for your Model 58 and the 215 grain cast bullet. The original police load for the caliber was a 210 grain swaged lead bullet (leaded horribly) at 800 fps which you should be able to duplicate easily with the 231/HP38.
I've been using a 210 grain cast SWC over 8.0 grains of Unique to duplicate the load ever since I started carrying a Model 58 on the force in the early 80s.
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Keep your powder dry.
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