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.38 Auto

Find In Stock 38 Auto Ammo For Sale- Top Ammo Retailers

The .38 ACP (Automatic Colt Pistol) also known as the .38 Auto was introduced at the turn of the 20th century for the John Browning-designed Colt M1900.

It’s not one of the most popular calibers, yet it has not become completely extinct either. A number of major ammo manufacturers, like LAX Ammo, still fabricate limited supplies of the .38 super each year.

About .38 Auto

  • Type: Pistol
  • Place of origin: United States
  • Designer: John Browning
  • Designed: 1900
  • Manufacturer Colt


  • Case type: Semi-rimmed, straight
  • Bullet diameter: .356 in (9.0 mm)
  • Neck diameter: .384 in (9.8 mm)
  • Base diameter: .384 in (9.8 mm)
  • Rim diameter: .406 in (10.3 mm)
  • Rim thickness: .050 in (1.3 mm)
  • Case length: .900 in (22.9 mm)
  • Overall length: 1.280 in (32.5 mm)
  • Primer type: Small pistol

Ballistic performance

Bullet mass/type Velocity Energy
115 gr (7 g) FMJ 1 150 ft/s (350 m/s) 338 ft⋅lbf (458 J)
125 gr (8 g) JHP 1 100 ft/s (340 m/s) 336 ft⋅lbf (456 J)
130 gr (8 g) FMJ 1 040 ft/s (320 m/s) 312 ft⋅lbf (423 J)

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