Difference between 45 Auto & 45 ACP

Discussion in 'Heckler & Koch Forum' started by scott_see, May 1, 2014.

  1. scott_see

    scott_see New Member

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    ImageUploadedByFirearms Talk1398965204.888291.jpg
    Whats the difference between 45 auto and 45 acp? I've researched this, and I've only found people saying they're the same thing. But then why would HK list both calibers on this chart?


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  2. Argyle_Armoring

    Argyle_Armoring New Member

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    They're the exact same cartridge. .45 Auto is the same thing as .45 ACP (Automatic Colt Pistol). Now .45 GAP is completely different.
     

  3. Quentin

    Quentin New Member

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    Yes, they're the same thing and many of us use the terms interchangeably (even HK obviously does). 45 Auto and 45ACP (45 Automatic Colt Pistol)

    As Argyle said 45GAP (45 Glock Automatic Pistol) is different and so is 45 Colt/45 Long Colt.
     
  4. Mercator

    Mercator Active Member

    They are synonymous. There is also the 45 Rim Auto, a specialty cartridge for revolvers only (you probably will never encounter it unless you look for it)
     
  5. JonM

    JonM Moderator

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    No such thing as 45 long colt. Its just 45 colt. There is also 45 schofield which is a s&w round. Long colt is slang.

    45 auto comes about from shortening the name of 45 automatic colt pistol used a lot as a sami/cip standard name.
     
  6. Quentin

    Quentin New Member

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    True, but the original term 45 Colt became confusing in the late 1800s when the US Army started issuing S&W revolvers that fired the .45 Schofield. The shorter .45 Schofield would fit and fire in the Colt SAA but the longer 45 Colt wouldn't fit in the new S&W so the term 45 Long Colt caught on and still is common today even though the .45 Schofield is as scarce as hen's teeth. I imagine the term "45 Long Colt" remained popular because of the shorter 45 ACP. Anyway, it shows there often are different names for the same cartridge.
     
  7. sweeper22

    sweeper22 New Member

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    I would go with the 45ACP over the 45A. Why? Because you get the A either way, so why not add the C and the P as well?

    Seriously though, it's just varying terminology for the same caliber.
     
  8. Sniper03

    Sniper03 Supporting Member Supporter

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    As they stated the 45 ACP and the 45 Auto are the same! I would guess what happened is one individual did a part of the listing and another individual did the other section. Or it could have been simply they did not remember what they had put in the other section. You will even find that happening here on the FTF on someones thread. They might address it in the Header of the Thread as the 45 ACP and then sometime in the Thread refer to it as the 45Auto! Simple error but not incorrect! *But both the same!

    03
     
  9. scott_see

    scott_see New Member

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    Got it. Thanks. What had me wondering is that it's a German company. I'm going to assume that an American does the website. Germans are the best proofreaders in the world. And they're big into consistency. I build websites for a living and my biggest client is German. It's amazing what he notices that everyone else misses.

    Thanks to all of you for setting the record straight.


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  10. JonM

    JonM Moderator

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    Don't even start wondering about 9mm... that's way worse of a nomenclature mess
     
  11. Mercator

    Mercator Active Member

    I think Long Colt is a descriptive nickname to more positively identify the cartridge vs the 45 Automatic Colt. Slang is sometimes more practical than the dictionary. The correct adjective for "easy to catch on fire" is inflammable. Yet in the hazmat lingo it is often flammable, a pidgin English word, so the folks won't mistake it for the opposite. I used to say 45 Long Colt all the time, so the guy at the counter would not ask me back "which one."