10mm Auto

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.

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

Although it was selected for service by the Federal Bureau of Investigation (FBI) in 1989, in the aftermath of the 1986 FBI Miami shootout, the cartridge was later decommissioned (except by the Hostage Rescue Team and Special Weapons and Tactics Teams) after their Firearms Training Unit eventually concluded that its recoil was too excessive for training average agents and police officers, and that the pistols chambered for the cartridge were too large for some small-handed individuals. These issues led to the creation of and following replacement by a shorter version of the 10mm that exists today as the .40 S&W, and while the 10mm never attained the mainstream success of this compact variant, there is still an enthusiastic group of supporters and users, and as of 2007, in recent years it has started to grow again in popularity.

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