not a semi auto (sorry) but on the subject of +p ammo, I have a Colt Agent .38 Spl (alloy frame Detective Special).
Lots of questions about it when it came out, and Colt took the position that it was ok to use +p BUT, you should send them the gun to have it checked out after 1,000 rounds, and every 1,000 there after.
Sadly, I don't think Colt will do or can do that anymore. I know I'll never come close to 1000 rnds of +p through that gun in my lifetime...
A friend of mine had the locking lugs of his Browning Hi Power peened by shooting some "+p" 9mm ammo, back in the mid 80s. No idea what the ammo was, other than European surplus something. Everything over standard is +p, but not all +p is SAAMI spec +p and some of it is much hotter. The fabled "hot European SMG ammo" too hot for pistols, probably does exist, though no one seems to be able to ID the maker or markings...
Be wary of stuff that is foreign made and loose packed (repacked), it may NOT be properly identified, and just might be something not good for your pistol. Treat it like Bubba's gun show reloads in a baggie. you don't and can't know for sure what it is, so its not safe to shoot, but can be broken down for the bullets, and maybe the brass. Toss the powder.