Is .45 ACP the name of the cartridge or the name of the gun?

I just bought Hornady Handbook of Cartridge Reloading 8th edition. On page 997 is says that .45 ACP is not the name of a cartridge. They say that .45 ACP is the name of the gun. I never heard of such. I thought .45 ACP was the cartridge. What do you think?

So...keeping things in the same context...every cartridge with the ACP designation was originally designed for a COLT automatic pistol?

25acp,32acp,380acp, and the 45acp? All Colts?

I always thought it stood for Automatic Cartridge Pistol.

I looked them all up....all designed by John Browning. He must have been working for Colt at the time because they are all Automatic Colt Pistols.

ABC = Automatic Browning Cartridge ?

From what I can tell, the "45 ACP" designation is for the 45 Automatic Colt Pistol. The cartridge was originally called the " 45 Auto" but everyone commonly referred to it as the 45 ACP and the name stuck.

Named for the pistol.

I have noticed some 380ACP that is designated 9mm BrC. From what I have been told it stands for Browning Cartridge. Of course I am also aware of the Kurtz name. I wonder why none of the 45 ever had the BrC name?

automatic colt pistol is right they where all designed by john browning he started the 1911 in 1906 i think it was call the 45 automatic pistol!

Ok, then what about .45 GAP? Is .45 Glock the name of the cartridge and .45 GAP that name of the pistol?

From Wikipedia;

"G.A.P. is an acronym for "Glock Automatic Pistol", and the .45 G.A.P. is the first commercially introduced cartridge identified with Glock."

The cartridge is shorter than a regular .45 Automatic (ACP).