Cartridge History

"D.B. Wesson designed a new centerfire cartridge to go with the new gun. Utilizing a .36 caliber (well, .359) bullet that fit snugly enough in the case to minimize the need for crimping by the reloader, the new cartridge was referred to as the .38 S&W, referencing the outside diameter of the case. 

Although introduced in 1876 as a black powder round, the .38 S&W is still loaded and sold as a smokeless round in the modern era, although S&W hasn't made a revolver chambered for it since the last Model 32 Terriers and Model 33 Regulation Police revolvers came off the line in 1974. 

Domestically the .38 S&W probably hung on as long as it did because it could fit in the cylinders of small-frame revolvers originally designed around the .32 S&W Long cartridge, unlike the longer .38 Special. Additionally, the maximum chamber pressure of 14,000psi made it friendlier to inexpensive revolvers than the newer cartridge, which topped out over 3,000psi more."

L to R: .32 S&W Long, .38 S&W, .38 S&W Special

Special thanks to History of Smith & Wesson, The Standard Catalog of Smith & Wesson, and Cartridges of the World*

*aka "The Big Book of Bullets", one of the best bathroom companions for gun nerds.

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