.45 Colt and .45 ACP cartridges compared
The .45 Colt (also known as .45 Long Colt) and .45 ACP (also known as .45 Automatic Colt Pistol) are two different cartridges commonly used in firearms. Here are some key differences between the two:
- Size and Shape: The .45 Colt cartridge is longer and larger in diameter than the .45 ACP cartridge. The Colt cartridge measures 1.6 inches in length and has a bullet diameter of .452 inches, while the ACP cartridge measures 1.26 inches in length and has a bullet diameter of .451 inches.
- Pressure: The ACP cartridge is loaded to a higher pressure than the Colt cartridge, typically around 21,000 PSI (pounds per square inch) compared to 14,000 PSI for the .45 Colt.
- Purpose: The Colt cartridge was originally designed for use in revolvers, while the ACP cartridge was designed for use in semi-automatic pistols. The .45ACP cartridge is also used in some submachine guns and carbines.
- History: The Colt cartridge has a longer history, having been introduced in 1873 for use in the Colt Single Action Army revolver. The ACP cartridge was introduced in 1905 for use in the Colt Model 1905 semi-automatic pistol.
- Ballistics: The Colt cartridge typically fires heavier bullets at slower velocities than the ACP cartridge. However, there are many different loads available for both cartridges, so the ballistics can vary widely depending on the specific load used.
Overall, the .45 Colt and .45 ACP cartridges are different in terms of size, pressure, purpose, history, and ballistics. It's important to use the correct cartridge for your firearm to ensure safe and reliable operation.
Reloading information for each cartridge can be found here:
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