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40 S&W

There have long been questions regarding the reason the .40 Smith & Wesson cartridge has been losing popularity, even though as of as late as 2011, some 65% of American law enforcement was carrying a pistol chambered in the round. The .40 S&W is a rimless pistol cartridge developed jointly by major American firearms manufacturers Smith & Wesson and Winchester. Wikipedia

• Bullet diameter: .400 in (10.2 mm)
• Case length: .850 in (21.6 mm)
• Case capacity: 19.3 gr H2O (1.25 cm3)
• Parent case: 10mm Auto
• Maximum pressure: 35,000 psi (240 MPa)
• Base diameter: .424 in (10.8 mm)
• Rim diameter: .424 in (10.8 mm