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.38-40 Win.
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Caliber Specifications:
Caliber: | .38-40 Win. |
Standard / Datasheet: | C.I.P. |
Bullet Diameter: | 0.400" | 10.16mm |
Primer Size: | Large Rifle (LR) |
Max. Case Length: | 1.305" | 33.15mm |
Max. Cartridge Length / OAL: | 1.590" | 40.39mm |
Max. Standardized Pressure: | 16679 psi | 1150 bar |
Case Capacity: | 38.5 Grains of Water | 2.50 cm3 |
CID: | CID_595 |
Last updated: | 2/20/2025 |
- The .38-40 Winchester was introduced in the late 19th century and was originally designed as a black powder cartridge for single-shot rifles. It has since become popular among law enforcement officers, military personnel, and civilian shooters as an effective self-defense round due to its accuracy, low recoil, and low cost.
The .38-40 Winchester is also commonly used for hunting small and medium game such as deer or antelope. Its penetration power makes it suitable for use against adversaries wearing body armor.
Over the years, the .38-40 Winchester has developed a reputation as a reliable caliber with excellent performance characteristics. With proper care and maintenance, this caliber can provide many years of reliable service. 
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Weight vs. Velocity - Suitable Bullets for this Caliber
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Barrel Length Variation vs. Velocity - by Bullet Weight
.38-40 Win. load data available with the following bullets:
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