Max SAAMI pressure of .38 special is 17500 psi. +P is either 18500 or 20000 psi, depending on the source. Not much of a difference.
My 642-2 is marked +P, but I still wouldn't be worried about it if it wasn't. They aren't designed so close to the minimum sufficient strength that it will explode at 17501 psi.
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Common sense isn't so common.
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