[MileHi]

The M1911 is a autoloading pistol, it is not a automatic pistol.

Then why is the cartridge that was designed for it called .45 ACP (Automatic Colt Pistol)?

I'll tell you why. Because Melas posts were correct. Self loading shotguns and pistols were known as automatics.

[Ratman83]

You can call it anything you want but it is a semi-automatic.