Product Overview: 357 Sig Ammunition

The .357 Sig is a high-performance pistol cartridge designed by the Swiss-German company SIG Sauer in 1994. It’s primarily known for its accuracy, flat trajectory, and high muzzle velocity, making it a popular choice among law enforcement and self-defense enthusiasts. The cartridge was developed by necking down a .40 S&W case to accept a 9mm (.355 inch) bullet. This design allows for the .357 Sig to deliver greater energy and improved penetration compared to the 9mm Luger, while maintaining manageable recoil.


  • Cartridge Type: Pistol
  • Designer: SIG Sauer
  • Year Designed: 1994
  • Parent Case: .40 S&W
  • Bullet Diameter: 9.02 mm (0.355 in)
  • Neck Diameter: 9.68 mm (0.381 in)
  • Shoulder Diameter: 10.77 mm (0.424 in)
  • Base Diameter: 10.77 mm (0.424 in)
  • Rim Diameter: 10.77 mm (0.424 in)
  • Case Length: 21.97 mm (0.865 in)
  • Overall Length: 28.96 mm (1.140 in)
  • Case Capacity: 1.27 cm³ (19.6 grains H2O)
  • Max Pressure: 44,000 psi (303 MPa)
  • Muzzle Velocity: 1,350 to 1,450 ft/s (with a 125-grain bullet)
  • Muzzle Energy: Approximately 500 ft·lbf


The .357 Sig is renowned for its high velocity and energy, which translate to excellent stopping power and barrier penetration. These characteristics make it a favored round for tactical situations where precision and reliability are critical.

Key Features

  • Accuracy: The .357 Sig’s design enhances accuracy due to its high velocity and flat trajectory.
  • Penetration: Capable of defeating barriers more effectively than some other common self-defense rounds.
  • Recoil: Manageable recoil comparable to the .40 S&W, allowing for quicker follow-up shots.
  • Reliability: Developed for law enforcement and military use, the .357 Sig is known for its consistent performance.

Common Uses

  • Law Enforcement: Widely used by various police departments and federal agencies.
  • Self-Defense: Popular among civilians for personal protection due to its stopping power.
  • Sport Shooting: Used in competitive shooting sports for its precision and performance.

  • .357 Sig
  • High velocity
  • Flat trajectory
  • Accuracy
  • Penetration
  • Self-defense
  • Law enforcement
  • Tactical ammunition
  • Stopping power
  • SIG Sauer
  • Competitive shooting
  • Handgun ammunition
  • Ballistic performance
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