There was a problem with that specific gun. I saw a Model 19 (357 Magnum) split the barrel with a factory 146 lead target load. There was a problem with the gun, not the ammo. Since 1982 S&W has had sporadic problems with guns blowing up, or barrels blowing off, and it's not the ammo doing it.
G keeps saying it: Before 1972 (or 74, I lose track) standard, run of the mill, regular old 38 Special ammo was routinely loaded at 20,000 - 21,000 PSI. All of the gun owners back then shot this ammo without concern. Including owners of alloy framed revolvers. Then the lawyers moved it and it all changed. Then 16,000 became the new standard and 18,000 was "+P" and everyone forgot about the fact that every 38 Special gun made since 1899 was designed to use 21,000 PSI ammo.
In 1955 Elmer Keith wrote of shooting 38/44 loads (158@1240) through a lightweight (alloy frame) Chiefs Special. The recoil was severe, but the loads caused no harm to the gun.
Again, everyone should do what makes him comfortable. I know that +P is a mild target load.