45 Auto and 45 ACP--Same?

45 Auto and 45 ACP--Same?

This is a discussion on 45 Auto and 45 ACP--Same? within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; Pretty sure on answer based on research but would like to hear it directly on the forum. I have a Kahr 45ACP and thought I ...

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Thread: 45 Auto and 45 ACP--Same?

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    Distinguished Member Array kelcarry's Avatar
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    45 Auto and 45 ACP--Same?

    Pretty sure on answer based on research but would like to hear it directly on the forum. I have a Kahr 45ACP and thought I had ordered 45ACP ammo--maybe I erred in my order but 5 boxes of 45 Auto were sent. right now I am of the opinion that this is a non-issue and they can both be fired from the Kahr. The 45 Auto is just that and it is not any of the other 45 caliber boutique types of 45--ie 45GAP etal. 45 Auto/45ACP--same? Yes or no.


  2. #2
    jsk
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    Yep, they're the same.

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    Agreed...they are the same. The ACP stands for "Automatic Colt Pistol", since the round was developed by Colt. The term "45 Auto" is used today by companies as a generic term for the same round. The term likely came from other manufacturers who did not want to give Colt any additional marketing.
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    Member Array ChrisATX's Avatar
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    .45 Auto = .45 ACP

    ACP = Automatic Colt Pistol
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    Yes

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    OD*
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    As mentioned, yes they are.

    To the history of the .45ACP, the cartridge (with a 200 grain bullet at that time) was designed by John Browning in 1904, for use in his then prototype M1905. Meaning, it was JMB's .45 calibre to be used in the Automatic Colt Pistol.


    (photo courtesy of Sam Lisker's Colt Autos.com)
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    VIP Member Array GhostMaker's Avatar
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    Quote Originally Posted by OD* View Post
    As mentioned, yes they are.

    To the history of the .45ACP, the cartridge (with a 200 grain bullet at that time) was designed by John Browning in 1904, for use in his then prototype M1905. Meaning, it was JMB's .45 calibre to be used in the Automatic Colt Pistol.


    (photo courtesy of Sam Lisker's Colt Autos.com)
    From henceforth I shall yield the floor to the Gentleman Shootist, and residing "Sultan of the Single Action" OD.

    I would call you "Guru" sir, but Col. Cooper holds that distinction still.........
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    OD*
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    I appreciate the kind sentiments, I really do.

    I am no guru by any means, just a student of the 1911 that is fortunate enough to learn something new about them everyday it seems.

    And you Sir are spot on about the Colonel.
    "The pistol, learn it well, carry it always ..." ~ Jeff Cooper

    "Terrorists: They hated you yesterday, they hate you today, and they will hate you tomorrow. End the cycle of hatred, donít give them a tomorrow."

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    OD
    You are as humble as you are good looking.
    We're not letting you get away with that humility.
    You ARE a 1911 Guru and we are fortunate to have you here.
    Many a time have you answered even my obscure 1911 related questions and queries both publicly and VIA private Mail.


    Quote Originally Posted by OD* View Post
    I appreciate the kind sentiments, I really do.

    I am no guru by any means, just a student of the 1911 that is fortunate enough to learn something new about them everyday it seems.

    And you Sir are spot on about the Colonel.
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    An obscure 45 round you may run into on occasion is the 45AR, AR meaning Auto Rim. This is a round identical to the 45ACP with the exception that it is a rimmed round whereas the ACP is rimless. The round was intended for use in the M1917 Colt since it did not require using half-moon clips.
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    QKShooter if you keep talkin like that OD will start wonderin if you are lookin for long, hot showers together snd he will end up filing a restraining order on you.



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    OD*
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    Thanks QK, but if the true were known, I'm fairly certain I have learned more from you, than you ever have from me.

    As an example, I did not know that the extractor test Vickers and Hackathorn are accepting credit for was developed by the late Master, Armand Swenson. I hadn't known that until you told me about it yesterday.
    "The pistol, learn it well, carry it always ..." ~ Jeff Cooper

    "Terrorists: They hated you yesterday, they hate you today, and they will hate you tomorrow. End the cycle of hatred, donít give them a tomorrow."

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    OD*
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    Quote Originally Posted by 357and40 View Post
    QKShooter if you keep talkin like that OD will start wonderin if you are lookin for long, hot showers together snd he will end up filing a restraining order on you.



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    One reason we both ALWAYS use soap-on-a-rope.
    QKShooter and bmcgilvray like this.
    "The pistol, learn it well, carry it always ..." ~ Jeff Cooper

    "Terrorists: They hated you yesterday, they hate you today, and they will hate you tomorrow. End the cycle of hatred, donít give them a tomorrow."

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    VIP Member Array 357and40's Avatar
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    Dang... OD is actually thinking about showering with QKShooter...

    Maybe I am the one that needs the restraining order.
    "I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched c-beams glitter in the dark near the Tannhšuser Gate. All those moments will be lost in time, like tears in rain."
    - Roy Batty

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    Somebody is inching a bit closer to becoming an Ex-Member.
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