For what it's worth, I asked S&W for their view on the matter and their (email) answer is as follows:
Quote:
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You cannot shoot .38 Super from a .357 magnum. This is an automatic round the diameter and length are both significantly different enough (being much closer to a 9mm) that the cylinder would have to be re-chambered to properly shoot these bullets.
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From a liability standpoint, it might be important for some to know S&W's viewpoint.