.38 S&W

The .38 S&W, also commonly known as .38 S&W Short (referred to as such to differentiate it from .38 Long Colt and .38 Special), 9×20mmR, .38 Colt NP (New Police), or .38/200, is a revolver cartridge developed by Smith & Wesson in 1877. Versions of the cartridge were the standard revolver cartridges of the British military from 1922 to 1963. Though similar in name, it is not interchangeable with the later .38 Special due to a different case shape and slightly larger bullet diameter.

.38 Smith & Wesson
A box of modern .38 S&W rounds
TypeRevolver
Place of originUnited States
Service history
In service1922–1963
Used byUnited Kingdom
Wars
Production history
DesignerSmith & Wesson
Designed1877
ManufacturerSmith & Wesson
Produced1877–present
Variants.38/200, .380 Rim, .38 Colt New Police, .38 S&W Super Police, MKE 9.65 mm Normal
Specifications
Case typeRimmed straight
Bullet diameter.361 in (9.2 mm)
Land diameter.350 in (8.9 mm)
Neck diameter.3855 in (9.79 mm)
Base diameter.3865 in (9.82 mm)
Rim diameter.440 in (11.2 mm)
Rim thickness.055 in (1.4 mm)
Case length.775 in (19.7 mm)
Overall length1.240 in (31.5 mm)
Primer typeSmall pistol
Maximum pressure14,500 psi (100 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
158 gr (10 g) LSWC 767 ft/s (234 m/s) 206 ft⋅lbf (279 J)
195 gr (13 g) LRN 653 ft/s (199 m/s) 185 ft⋅lbf (251 J)
200 gr (13 g) LRN 620 ft/s (190 m/s) 176 ft⋅lbf (239 J)
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