This whole apprehension thing about the danger of using +P loads is insane. +P is perfectly safe to use in ANY steel frame .38 Special revolver - even the oldies. The real reason not to use it is economics - it costs too much.

Be aware that back in the "old days" of the 1930s, the ammunition companies advertised .38/44 ammunition (under whatever name) as being safe to use in ANY revolver chambered in .38 Special, even the old ones from pre-WWI that were not heat-treated. And the .38/44 loads were far more potent than today's +P loads, over 1100 ft/sec with a 158 grain bullet. The only warning they provided was that of substantially greater recoil when fired in lighter revolvers.