The .45 ACP is a powerful, big bore round that's popular among American shooters. It's one of the big three of defensive handgun calibers and has withstood the test of time. At Ammunition Depot, we offer bulk 45 ACP ammo from a variety of manufacturers. Make sure you check out our Prepper options! Our Prepper Packs come in either a NATO Style Battle Pack or our 21st Century spam cans. They are designed for long-term storage with the ammunition sealed and protected from any environment.