The steel in the 32 H&R cylinder is the same steel used in all S&W regardless of caliber, so there is no problem with that. I seriously considered reaming my 16-4 for 327, but decided not to. I worked up loads for the 32 H&R with a 100 gr. Hornady STP that exceeds 1200 fps, and that fulfills whatever I need to do. (And it exceeds 1000fps out of the 1 17/8" barrel of the 431PD). If I need more I'll use a bigger caliber.

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H Richard
SWCA1967 SWHF244