Can't argue with what you have in your hands and say.
I must admit that I have loaded .38 S&W brass (it was actually all copper cases) with cast .355 HP 9MM bullets and used .38Spec/.357Mag sizing dies. But those were to fire in a Marlin top break .38 S&W revolver, circa 1886 and didn't want to tax it at all.
As I no longer own any .38s/.357s, I can't try factory .38 S&W in one/any. But the SAAMI specs list a fatter case body.
(I may come into a P225 next month, was IPD I think)