Todays +P rounds are not loaded very hot. Although they can be a challenge in a J frame, Any K frame in good mechanical condition should have no issues.
If you want to see the ratings for any cartridge here is a good link
That is why I love this forum. There is always someone on here that can always answer a question(very knowledgable folks) I've learned a lot of things here.
Joe.
When we consider the small amount of change that was required to turn a M64 into a M65, which runs at about twice the pressure, its not too surprising to hear that a M64 can take plus P, at a pressure increase of about 10%.