A Model 10 .357 Magnum is NOT the same as a Model 10 .38 Special. Everybody knows that the K Frame can handle the .357 Magnum cartridge. They just tend to be chambered for .357 Magnum and not .38 Special.
My Model 64s will shoot and extract so-called factory loaded +P+ all day long. What does that tell me? Now that the factories have hyped the +P and +P+ designations for all they're worth, maybe now they can introduce +P++ and charge you even more for a questionable gain in velocity. Anybody who handloads .38 Special will realize that a Model 64 can not handle the same loads and pressures that even a J Frame Model 60 can handle, and it's because the cylinder walls and position of the stop notches over the chambers are the weak link in the K Frame .38 Special platform...
