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.38-45 ACP
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Caliber Specifications:
Caliber: | .38-45 ACP |
Standard / Datasheet: | C.I.P. |
Bullet Diameter: | 0.357" | 9.07mm |
Primer Size: | Small Pistol (SP) |
Max. Case Length: | 0.898" | 22.81mm |
Max. Cartridge Length / OAL: | 1.248" | 31.70mm |
Max. Standardized Pressure: | 34084 psi | 2350 bar |
Case Capacity: | 22.0 Grains of Water | 1.43 cm3 |
CID: | CID_596 |
Last updated: | 2/20/2025 |
- The .38-45 ACP cartridge is a modified version of the .45 ACP cartridge, which was developed by John Browning in 1904. The .38-45 ACP was created by necking down the .45 ACP case to accept a .357 inch (9.1 mm) bullet.
The .38-45 ACP cartridge was developed in the early 1900s as an experimental round for the US military. It was intended to be a replacement for the .38 Long Colt cartridge, which was deemed inadequate in combat.
The .38-45 ACP cartridge was tested extensively, but it was ultimately rejected in favor of the .45 ACP cartridge, which was considered to be more reliable and effective. Today, the .38-45 ACP cartridge is considered to be a historical curiosity and is not commonly used or available. 
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Most popular powders from our community members for caliber .38-45 ACP:
Weight vs. Velocity - Suitable Bullets for this Caliber
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Barrel Length Variation vs. Velocity - by Bullet Weight
.38-45 ACP load data available with the following bullets:
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