10mm Auto

10mm Auto
10mm Auto jacketed flat point cartridge
TypePistol
Place of originUnited States/Sweden
Service history
Used by
Production history
Designer
Designed1983
Produced1983–present
Variants
Specifications
Parent case.30 Remington
Case type
Bullet diameter
  • C.I.P.: 10.16 mm (0.400 in)
  • SAAMI: .4005 in (10.17 mm)
Neck diameter
  • C.I.P.: 10.74 mm (0.423 in)
  • SAAMI: .423 in (10.7 mm)
Base diameter
  • C.I.P.: 10.80 mm (0.425 in)
  • SAAMI: .425 in (10.8 mm)
Rim diameter
  • C.I.P.: 10.80 mm (0.425 in)
  • SAAMI: .425 in (10.8 mm)
Rim thickness
  • C.I.P.: 1.40 mm (0.055 in)
  • SAAMI: .055 in (1.4 mm)
Case length
  • C.I.P.: 25.20 mm (0.992 in)
  • SAAMI: .992 in (25.2 mm)
Overall length
  • C.I.P.: 32.00 mm (1.260 in)
  • SAAMI: 1.260 in (32.0 mm)
Case capacity1.56 cm3 (24.1 gr H2O)
Rifling twist406.40 mm (1 in 16 inches)
Primer typeLarge pistol
Maximum pressure (C.I.P.)230 MPa (33,000 psi)
Maximum pressure (SAAMI)37,500 psi (259 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
175 gr (11 g) STHP Winchester 1,290 ft/s (390 m/s) 649 ft⋅lbf (880 J)
180 gr (12 g) FMJ Federal 1,300 ft/s (400 m/s) 708 ft⋅lbf (960 J)
77 gr (5 g) RBCD TFSP 2,420 ft/s (740 m/s) 1,001 ft⋅lbf (1,357 J)
155 gr (10 g) Underwood XTP-JHP 1,500 ft/s (460 m/s) 775 ft⋅lbf (1,051 J)
155 gr (10 g) Underwood FMJ-FN 1,500 ft/s (460 m/s) 775 ft⋅lbf (1,051 J)
Test barrel length: 117 millimetres (4.6 inches)
Source(s): Underwood Ammunition XTP-JHP

Underwood Ammunition FMJ-FN

RBCD Performance Plus Ammunition

The 10mm Auto (also known as the 10×25mm, official C.I.P. nomenclature: 10 mm Auto, official SAAMI nomenclature: 10mm Automatic) is a powerful and versatile semi-automatic pistol cartridge introduced in 1983. Its design was adopted and later produced by ammunition manufacturer FFV Norma AB of Åmotfors, Sweden.

The 10mm was selected for service by the Federal Bureau of Investigation (FBI) in 1989 in the aftermath of the 1986 FBI Miami shootout. During the testing and development process, the FBI Firearms Training Unit developed a downloaded version of the 10mm cartridge which they felt provided adequate performance while minimizing recoil and muzzle blast. It is commonly claimed that this reduced loading was developed as the result of complaints or training problems involving agents who were issued the 10mm, but the reduced loading was developed before any pistols were issued. The cartridge was later decommissioned (except for use by the Hostage Rescue Team and Special Weapons and Tactics Teams) primarily due to problems with the S&W 10mm issue pistols which were recalled in 1991. That same year, the FBI began issuing SIG pistols chambered in 9mm as an interim solution while problems with the S&W 10mm pistols were being worked. In the meantime, S&W and Winchester developed the .40S&W cartridge which duplicated the performance of the FBI's reduced 10mm loading but in a shorter package which was suited for use in pistols sized for the 9mm cartridge. The .40S&W was introduced in 1990, but the FBI didn't adopt it for some years thereafter. The FBI eventually switched to the .40 S&W cartridge, and began issuing .40S&W pistols to agents in 1997. The .40S&W remained the FBI's issue cartridge until they reverted to the 9mm in 2015.

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