The cartridge designations incorporating "ACP" were obsoleted by SAAMI prior to WWII and replaced with the "AUTO" designations. Where have you and most of the uniformed gun writers been for 75 years?
To paraphrase James Carville, "Its the head stamp, stupid"!
Go to "SAAMI.org" to learn the correct designations of all American cartridges.
It matters not how many examples of other folks that you can find that are also ignorant of proper cartridge designations. And, do not waste your time, or others, by providing a listing of other folks using incorrect cartridge designations. Lots and lots of wrongs never make a right.
It is no more appropriate to use an obsolete cartridge designation than it is to address a married woman by her maiden name.
Yes, SAAMI is a very useful organization indeed. Its efforts in providing exact information about, say, the difference between a 223 Remington cartridge and a 5.56 cartridge can be life-saving for the user who might make the mistake of equating them.
Despite your admonition not to provide a “list,” I will.
There are manufacturers out there that have used, and still use, ACP designations. Dynamic Research Technologies uses ACP - I have several calibers in my ammo safe that bear that designation. I also have some post WWII ammo in military packaging that say 45 ACP Tracer on them.
The point in this being that not all knowledge is ‘proper,’ particularly when it comes to usage; you need only go to Webster’s Dictionary to see the change in meaning and usage of a number of words.
SAAMI does a good job to get specifications out there that matter and I applaud them. But they are not a governing body that regulates everyone. People and companies use their output, but are not required to unless they agree to adhere to their specifications in some formal agreement as a Member Company.
As for AUTO and ACP designations, I suspect the primary reason for the name change was to get the “Colt” out of “Automatic Colt Pistol” designation for the cartridge in deference to the other member companies.
You should be ashamed of your condescending reply to the OP. The tone was rude, and to top it off, you’re wrong.
Many industry professionals use the terms 380 ACP and 380 Auto interchangeably. The same is true for 45 ACP and 45 Auto. The head stamp and SAAMI designations serve a purpose, but it’s silly to suggest they must be used exclusively.
For example, if you look at the current website of MidwayUSA, you will see that they list 9 X 17mm ammo as “380 ACP”, and 11.43 X 23mm as “45 ACP”. The website of Natchez Shooters Supply does the same. Brownells lists them with both designations on the same line: “380 Auto (ACP)” and “45 Auto (ACP)”. To complain that only the exact SAAMI head stamp should be used in this context is as silly as saying the decimal point shouldn’t be ommitted before the caliber numbers.
The same thing can be said of the 7.62 X 17mm pistol cartridge being called 32 ACP and 32 Auto, and 9 X 19mm as 9mm Parabellum and 9mm Luger.
You owe the OP an apology.
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Folks with abundant knowledge and confidence often seem arrogant to those without.
And some folks are just arrogant.