My S & W 642 .38 Airweight is +P rated. However I only use these for CC. I use regular loads for practice.
That brings up a good point -
Even if the manufacturer does rate the firearm for +P loads, it still may not be a good idea to feed those loads to the handgun on a regular basis.
The ".38 Special +P" S&W Airweights/Ladysmiths are a perfect example. They're built on the 'magnum' frame with the same cylinders as the .357 Magnum versions, and have "+P" stamped right on the barrel.
But... actually feeding them a steady diet of +P ammunition will shake them apart in no time at all. They are built to handle the pressure with limited
use - not digesting it on a regular basis. My own S&W 642 has had less than 250 rounds through it, and already has issues. Everything I have put through it was +P ammunition. (I don't think the previous 2 owners put more than 20 rounds through it, total. The original owner carried it for 3 years, and the second owner was scared of it after firing only 2 shots.)