.45 Caliber Question

[Gunfighter420]

Is .45ACP and .45Auto the same thing and .45 Colt different?

[Jonathan Doe]

45 Auto and 45 ACP are the same. 45 Colt is different.

http://en.wikipedia.org/wiki/.45_ACP

http://en.wikipedia.org/wiki/.45_Colt

[Biigg50]

45 auto and 45 automatic colt pistol (ACP) are the same. But 45 Colt or 45 LC or 45 Long Colt are different than the first two.

[jak77]

What they said. ACP + Auto = same.