Military Wiki
.38 Long rimfire
5 rounds of .38 Rimfire long.JPG
Type Pistol, rifle
Place of origin United States
Service history
Used by US Army
Production history
Variants short, long, extra long.
Bullet diameter .356 in (9.0 mm)
Neck diameter .376 in (9.6 mm)
Shoulder diameter .376 in (9.6 mm)
Base diameter .376 in (9.6 mm)
Rim diameter .437 in (11.1 mm)
Rim thickness .052 in (1.3 mm)
Case length 0.866 in (22.0 mm)
Overall length 1.341 in (34.1 mm)
Primer type rim
Ballistic performance
Bullet weight/type Velocity Energy
150 gr (10 g) 980 ft/s (300 m/s) 320 ft·lbf (430 J)
Test barrel length: Rifle

.38 rimfire cartridges are a type of ammunition that have been in service in the United States since the mid-nineteenth century. The cartridges are produced in short, long and extra long variants.

Much like the smaller .32 Rimfire, the rounds were originally manufactured loaded with black powder. In the early 1900s, manufacturers switched to the "new" smokeless powder.

The .38 rimfire was preferred to the .32 rimfire for hunting and self-defense purposes because of its larger size and increased power.


The .38 rimfire cartridge was a common round for many antique revolvers and rifles from the 1870s to the early 1900s. It was a common self-defense round for a small revolver that was often kept in a vest pocket through the 1890s. Nowadays the only known company that still produces the .38 rimfire is the Navy Arms Company. in Union City, New Jersey.

Uses and variants[]

The .38 rimfire cartridge was available in short, long, extra long, and also shotshells. Most of the revolvers and rifle which were produced were chambered for either .38 short, or .38 long. While there were a few different rifles produced for the .38 extra long cartridge and a few rolling block, falling block, and bolt action rifles had smooth bore barrels which had a slight choke to it so you could shoot the .38 RF shotshells out of it which was good for hunting small game at close ranges. a very common company that had revolvers and rifles chambered for the .38RF was Hopkins & Allen.

See also[]


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