I don't doubt that it can happen on a barrel that hasn't been fitted properly. The difference between too tight or to loose is only a matter of a few thousands of an inch at the shoulder, and I'm sure that even the factories mess up now and then. I have uninstalled and reinstalled numerous Colt barrels, and getting them off can be anything from a gentle tug to "lean on it until the workbench moves". I wouldn't be surprised if the S&Ws are the same.
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