7.62mm UKM

7.62mm UKM
TypeRifle
Place of originGermany
Service history
In serviceNever issued
Production history
DesignerMichael Uekötter
Designed2002
No. builtsmall batch for C.I.P. registration
Specifications
Parent case.338 Lapua Magnum
Case typeRimless, bottleneck
Bullet diameter7.82 mm (0.308 in)
Neck diameter8.68 mm (0.342 in)
Shoulder diameter14.06 mm (0.554 in)
Base diameter14.91 mm (0.587 in)
Rim diameter14.93 mm (0.588 in)
Rim thickness1.52 mm (0.060 in)
Case length57.00 mm (2.244 in)
Overall length79.00 mm (3.110 in)
Case capacity5.84 cm3 (90.1 gr H2O)
Rifling twist254 mm (1-10")
Primer typeLarge rifle magnum
Maximum pressure440.00 MPa (63,817 psi)
Ballistic performance
Bullet mass/type Velocity Energy
155 gr (10 g) Lapua Scenar BTHP 3,468 ft/s (1,057 m/s) 4,141 ft⋅lbf (5,614 J)
168 gr (11 g) Sierra BTHP 3,300 ft/s (1,000 m/s) 4,062 ft⋅lbf (5,507 J)
181 gr (12 g) RWS TUG 3,240 ft/s (990 m/s) 4,219 ft⋅lbf (5,720 J)
185 gr (12 g) Berger BTHP 3,149 ft/s (960 m/s) 4,073 ft⋅lbf (5,522 J)
220 gr (14 g) Sierra BTHP 2,982 ft/s (909 m/s) 4,345 ft⋅lbf (5,891 J)
Test barrel length: 27.5" (699 mm)
Source(s): [1]

The 7.62mm UKM [7.62×57mm] is a specialized rimless bottlenecked centerfire cartridge developed for long-range rifles. The commercially successful .338 Lapua Magnum cartridge has functioned as the parent case for the 7.62mm UKM, which is essentially a necked-down shortened version of the .338 Lapua Magnum. The .338 cartridge case was used for this since it has the capability to operate with high chamber pressures which, combined with smaller and hence lighter bullets result in high muzzle velocities.

  1. ^ The 7.62mm UKM. A German 300 Magnum Wildcat Extraordinary. and QuickLOAD (pressure limit of 470 MPa applied).