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.40 S&W
40 S&W - FMJ - 2.jpg

.40 S&W FMJ flat-point cartridge
Type Pistol
Place of origin United States
Production history
Designer Bob Klunk
Designed January 17, 1990
Produced 1990–present
Specifications
Parent case 10mm Auto
Case type Rimless, straight
Bullet diameter .400 in (10.2 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 length 1.135 in (28.8 mm)
Case capacity 19.3 gr H2O (1.25 cm3)
Rifling twist 1 in 16 in. (406 mm)
Primer type Small pistol
Maximum pressure 35,000 psi (240 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
10.69 g (165 gr) Federal FMJ 1,130 ft/s (340 m/s) 468 ft⋅lbf (635 J)
7.45 g (115 gr) Cor-Bon Glaser 1,400 ft/s (430 m/s) 500 ft⋅lbf (680 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)
12.95 g (200 gr) Doubletap FMJ FP 1,050 ft/s (320 m/s) 490 ft⋅lbf (660 J)
Test barrel length: 4 inches (100 mm)
Source(s): 

The .40 S&W is a rimless pistol cartridge developed jointly by major American firearms manufacturers Smith & Wesson and Winchester. The .40 S&W was developed from the ground up 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 (9mm size) semi-automatic handguns. It uses 0.40-inch (10 mm) diameter bullets ranging in weight from 105 to 200 grains