and 'hot' means a higher internal pressure than standard pressure which increases the muzzle velocity. i've never looked at the actual numbers but +p is around 10% hotter than standard pressure. then there's +p+....
not all manufacturers will recommend +p ammo in their handguns.
I have a Ruger LCR .38 that I have shot both .38 and .38+P rounds. The added kick from the +P rounds can be a little hard on the hand. so I usually just shoot a few of the +P and save them for defense rounds, and practice with the standard rounds.
Prescribed Fire is Mother Nature's plastic surgeon.