No. From page 56 of the Taurus catalog there is no SAAMI specification for +P in .45 Long Colt caliber, therefore the warranty will be void if so called +P is fired.
http://www.taurususa.com/2009catalog/?catalog_page=56
Harry P. Ness from down south says oh yeah!
yes
What does the owner's manual say?
You will have to contact Taurus. As a general rule, a steady diet is not recommended.
Yes, but not on model 80
As long as the +p is SAAMI approved ammunition
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.
Follow recommendations in the owner's manual
All production models of the Mod 36 and Mod 37 manufactured in 1998 or later are rated for +P ammunition. Prior to that date, no guarantees.
No. This was made long before +P ammo was created.
1. It can, but, it is not advised. 2. It is stated by Smith and Wesson that the model 14-3, which is the third change of the model 14 can safely shoot plus P ammunition.
Yes. Shooting a lot will accelerate wear on the gun, but occasional use is OK.