SAAMI std ammo is 35,000 psi. Up to 38,500 is +P. US mil-spec M882 is 36,250. Most NATO ammo is around 38,500 or hotter (some is lower).
BHPs seem to last a lot longer if ya stick to stuff below 35,000. A lot of +P stuff and they can break under 40,000 rounds. Have seen two break at 14,000 that were fed lottsa very hot stuff (+P+). British mil-spec is pretty hot, saw plenty of broken BHPs in their armory when I was stationed in Europe in the late 70s early 80s.
I have never really thought the difference between std and +P 9mm ammo was worth the trouble to fnd practice ammo to match. Unless I needed hot FMJ for barrier penetration, I would shoot the cheap stuff and carry hot and not worry about it. I did/do, works for me.