Yes per conversation with Springfield Inc. it is safe to use +p or +p+ FACTORY ammunition, but it can accelerate wear on the weapon at a higher rate.
S&W does not sell the XD. Springfield Armory does.
As a licensed Type 1 FFL dealer and certified gunsmith, I tend to favour the Springfield product. But both are good - neither one is particularly fantastic out of the box, but they both clean up quite nicely.
380 and 9mm ammunition IS NOT INTERCHANGEABLE.
380 and 9mm ammunition IS NOT INTERCHANGEABLE.
9mm Luger full metal Jacket.
Yes
The 9mm Parabellum is the proper name of the 9mm Luger cartridge.
Yes it is. A steady diet of plus P ammunition decreases the service life however
9mm Luger. The CZ is a great pistol.
No
Those that are marked for 9mm ammunition. Shotguns, rifles, handguns all have been or are chambered for 9mm
There were several types of 9mm ammunition made. The most common is the 9x19, also known as 9mm Parabellum or 9mm Luger. If your firearm is marked as any of those, than this is the only type of 9mm ammunition it can facilitate. If you are uncertain about which type of ammo can be used with your firearm, consult a gunsmith.