Without this being a direct response to the OP's question, few people realise that the J frame Smiths in .38 Spl and the K frame Smiths in .357 Magnum and the N frame Smiths in .44 Magnum were the direct result of WW2 tech improvements. All introduced in the 1950s, these models were made possible because during the War, 'induction hardening' was perfected; allowing the smaller frames and cylinders to stand up to the Magnum pressures.
From that emanated the aluminium framed J frames, during the USAF trials of the '50s; and the M39 for same (and the Colt Commander). It turned out that the aluminum cylinders of the J frames were still not strong enough and were replaced by steel.
It is a myth, thoroughly debunked, that the K frame .357 was created for Bill Jordan as his 'dream gun'. Instead the revolver was well underway before Smith execs approached him, and they were already calling it a 'dream gun'. It came out of the Combat Masterpiece in .357 project for the FBI, encouraged by the couple who operated Evaluators Ltd as a Marines family.