The 3rd issue post 72 is rated for 3K+P. Second issue with the shrouded ejector is rated for 1K, (it used to be 1.5K before Colt dropped it to 1K).
+P was not recommended for pre '72 with exposed ejector.
This isn't to say the use of +P will blow the gun up, but with regular usage it will accelerate wear on the handgun, particularly the top strap area.
ETA I have the 3rd issue but I still use Hornady Custom 158 gr. Jacketed Hollow point XTP in mine.