{"id":5544,"date":"2020-04-15T18:49:33","date_gmt":"2020-04-15T18:49:33","guid":{"rendered":"https:\/\/www.ammunitiontogo.com\/lodge\/?p=5544"},"modified":"2025-10-01T20:25:29","modified_gmt":"2025-10-01T20:25:29","slug":"45-auto-vs-45-acp","status":"publish","type":"post","link":"https:\/\/www.ammunitiontogo.com\/lodge\/45-auto-vs-45-acp\/","title":{"rendered":"45 Auto vs. 45 ACP: What’s the Difference?"},"content":{"rendered":"

It’s a common question among our customers when looking at ammo for their 1911 or Glock 21 – do they need to be wary of\u00a045 ACP vs. 45 Auto and vice-versa?<\/p>\n

What’s the Difference Between 45 Auto and 45 ACP?<\/h2>\n

There is no difference between 45 Auto and 45 ACP. They are in fact one and the same, which leads us to the point of this article: Some cartridges have more than one name. Some have many, in fact, to the point where an inexperienced shooter may wonder if they are ordering the correct ammunition.<\/p>\n

History of the 45 ACP vs. 45 Auto Cartridge<\/h3>\n

\"45<\/p>\n

The cartridge called .45 ACP<\/a> (or .45 Auto) was designed by the great John Browning in 1904. The gunsmith created the round for a new .45 caliber semi-automatic pistol that he was also designing for Colt. While Mr. Browning designed a great many firearms for his own company, he was not ungracious toward Colt whom he worked for as well. He therefore didn\u2019t object when his client decided to name their new round the .45 Colt Automatic Pistol, or .45 ACP for short.<\/p>\n

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\n 50rds - 45 ACP Federal American Eagle 230gr. FMJ Ammo <\/div>\n <\/div>\n <\/a>\n <\/div>\n
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\n 1000rds - 45 ACP Federal American Eagle 230gr. FMJ Ammo <\/div>\n <\/div>\n <\/a>\n <\/div>\n