Welcome to the forum. Next time you stop in, go to our "Introductions" area and say "Hi".
Thumbs up for reading your owner's manual and finding out manufacturer's view on using +P.
I am confused, though. Why did you purchase a .45 ACP, and then want to shorten the life of your handgun and use +P in the first place?
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)