Unless your owner's manual for the PT1911 states that the barrel is rated for .45 ACP +P ammunition, I would not risk damaging my pistol, or myself trying to shoot this powerful load. Regular .45 ACP ammo is more than sufficient for most circumstances.
You will have to contact Taurus. As a general rule, a steady diet is not recommended.
Yes. Shooting a lot will accelerate wear on the gun, but occasional use is OK.
The mfg. Says yes you can
Yes, you can but it is NOT recommended. Only shoot +p ammo in .38SPL guns that are marked as +P.
Yes, but not on model 80
Not recommended unless the maker says it is OK to do.
Depends on how old the revolver is.
NO
You must call S&W and ask.
As long as the +p is SAAMI approved ammunition
You need to contact S&W for a correct answer.
No. It's not rated for +P ammo. The 649 is, though.