.40 S&W

".40" and ".40 caliber" redirect here. For other cartridges with this diameter, see 10 mm caliber.

.40 S&W
.40 S&W FMJ flat-point cartridge
TypePistol
Place of originUnited States
Production history
Produced1990–present
Specifications
Parent case10mm Auto
Case typeRimless, straight
Bullet diameter.400 in (10.2 mm)
Land diameter.390 in (9.9 mm)
Neck diameter.423 in (10.7 mm)
Base diameter.424 in (10.8 mm)
Rim diameter.424 in (10.8 mm)
Rim thickness.055 in (1.4 mm)
Case length.850 in (21.6 mm)
Overall length1.135 in (28.8 mm)
Case capacity19.3 gr H2O (1.25 cm3)
Rifling twist1 in 16 in. (406 mm)
Primer typeSmall pistol
Maximum pressure35,000 psi (240 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
11.66 g (180 gr) Blazer FMJ FP 985 ft/s (300 m/s) 388 ft⋅lbf (526 J)
10.69 g (165 gr) Federal FMJ 1,130 ft/s (340 m/s) 468 ft⋅lbf (635 J)
10.04 g (155 gr) Federal HST 1,160 ft/s (350 m/s) 463 ft⋅lbf (628 J)
8.74 g (135 gr) Underwood JHP 1,400 ft/s (430 m/s) 588 ft⋅lbf (797 J)
5.44 g (84 gr) Magsafe Defender 1,800 ft/s (550 m/s) 604 ft⋅lbf (819 J)
Test barrel length: 4 inches (100 mm)
Source:

The .40 S&W is a rimless pistol cartridge developed jointly by American firearms manufacturers Smith & Wesson and Winchester in 1990. The .40 S&W was developed as a law enforcement cartridge designed to duplicate the performance of the Federal Bureau of Investigation's (FBI) reduced-velocity 10mm Auto cartridge which could be retrofitted into medium-frame (9 mm size) semi-automatic handguns. It uses 0.40-inch-diameter (10 mm) bullets typically ranging in weight from 105 to 200 grains (6.8 to 13.0 g).

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