# 45 ACP vs. 45 Auto: Are They the Same, or Different?

**URL:** <https://sixguns.com/t/45-acp-vs-45-auto-are-they-the-same-or-different/1522>\
**Category:** Public Shooting Range\
**Tags:** 45acp\
**Created:** [July 12, 2025, 5:35am UTC](https://sixguns.com/t/45-acp-vs-45-auto-are-they-the-same-or-different/1522 "2025-07-12T05:35:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ammodotcom](https://sixguns.com/user_avatar/sixguns.com/ammodotcom/32/1880_2.png) [@Ammodotcom](https://sixguns.com/u/Ammodotcom)\
**Post date:** [July 12, 2025, 5:35am UTC](https://sixguns.com/t/45-acp-vs-45-auto-are-they-the-same-or-different/1522/1 "2025-07-12T05:35:19Z")

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“45 ACP” and “45 Auto” are two different names for the same exact cartridge. “ACP” stands for “Automatic Colt Pistol,” so when you see “45 ACP” on one box of ammo and “45 Auto” on another, you can rest assured they’re one and the same.

## 45 ACP Ammo at [Ammo.com](https://ammo.com/)

[Ammo.com](https://ammo.com/) offers high-quality 45 ACP ammo at incredible prices. Whether you need [bulk 45 Auto ammo](https://ammo.com/bulk-ammo/bulk-45-acp-ammo) or just a box of self-defense rounds, we have you covered.

## Are the 45 ACP and 45 Auto the Same?

Yes, 45 ACP and 45 Auto are the same cartridge. The acronym in “45 ACP” stands for “Automatic Colt Pistol.” Shooters use the terms “45 Auto” and “45 ACP” interchangeably when referring to this type of handgun ammunition.

## What Does ACP Stand For?

“ACP” stands for “Automatic Colt Pistol.” The same holds true for both 45 ACP and 380 ACP ammunition.

_45 ACP vs. 45 Auto: Are They the Same, or Different? originally appeared on [Ammo.com](http://Ammo.com)_

[https://ammo.com/comparison/45acp-vs-45-auto](https://ammo.com/comparison/45acp-vs-45-auto)