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40 S&W Ammo

Browse In-Stock 40 S&W Ammo For Sale- Top Ammo Vendors

The .40 S&W is a rimless pistol cartridge developed jointly by major American firearms manufacturers Smith & Wesson and Winchester.

Smith & Wesson and Winchester introduced .40 Cal bullets in 1990, just six months after the Federal Bureau of Investigation requested the development of ammunition with the stopping power of the .45 ACP, but with the ease of use of the 9mm.

40 S&W quickly caught on and remains a popular caliber for personal protection and range training today. .40 cal ammo is still very common among shooters today and is one of the more modern rounds available to American civilian shooters.

About .40 S&W

  • Type: Pistol
  • Place of origin: United States
  • Designer: Bob Klunk
  • Designed: January 17, 1990
  • Produced: 1990–present


  • 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 1,050 ft/s (320 m/s) 490 ft⋅lbf (660 J)

Discover a vast collection of .40 S&W ammo from top ammo retailers at Bulk Cheap Ammo. We are a leading ammo directory to find in stock ammo fast in place.

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ATTENTION: The following locations have ammunition restrictions.

California - Retailer must ship to FFL.

Connecticut - Retailer must have your ACE or Pistol Permit and State ID on file or ship directly to and FFL.

Illinois - Retailer must have your FOID and State ID on file.

Illinois (Chicago) - Retailer must ship to an FFL.

Massachusetts - Retailer must have your ACE or Pistol Permit and State ID on file or ship directly to an FFL.

New York - Retailer must ship to an FFL.

New York (New York City) - No ammo shipments allowed.

New Jersey - A copy of your current Drivers License and Firearms Purchaser ID Card are required before a retailer can ship the order.

Please check local laws and shipping policy before placing an order.