NOTHING is rated for +P+ ammo. That's because there is no definition for +P+. SAAMI defines the specs for a load, and sometimes a +P load. +P+ means it is a load beyond the SAAMI specs and could be anything. S&W supports SAAMI spec ammo, which includes +P.
sure, cor-bon may sell a +P+, but technically bubba's 9mm with 6gr of titegroup in it is +P+ too. It'll also break your gun.
with +P+ you simply take your chances. In a moder durable pistol, I'd probably trust cor-bon, but not the terrorist-ripper 4000 +P+ with ultramysticdeathalloy. But it's still mycall.