7.92×33mm Kurz

German 7.92×33mm Kurz cartridge

Type

Rifle

Place of origin

Germany

Service history

Used by

Nazi Germany

Wars

World War II - present day

Production history

Designer

Polte ammunition works, Magdeburg

Designed

1938

Specifications

Parent case

7.92×57mm

Case type

Rimless, bottleneck

Bullet diameter

8.22 mm (0.324 in)

Neck diameter

9.10 mm (0.358 in)

Shoulder diameter

11.40 mm (0.449 in)

Base diameter

11.94 mm (0.470 in)

Rim diameter

11.95 mm (0.470 in)

Rim thickness

1.30 mm (0.051 in)

Case length

33.00 mm (1.299 in)

Overall length

48.00 mm (1.890 in)

Case capacity

2.22 cm³ (34.3 gr H₂O)

Rifling twist

240 mm (1 in 9.45 inch)

Primer type

Berdan

Maximum pressure (C.I.P.)

340.00 MPa (49,313 psi)

Ballistic performance

Bullet mass/type	Velocity	Energy
8.0 g (123 gr) FMJBT	685 m/s (2,250 ft/s)	1,886 J (1,391 ft·lbf)
8.1 g (125 gr) Ball	685 m/s (2,250 ft/s)	1,909 J (1,408 ft·lbf)

Test barrel length: 419 mm
Source(s): "Cartridges of the World"

The 7.92×33mm Kurz (designated as the 7.92 x 33 kurz by the C.I.P.) is a rimless bottlenecked rifle cartridge developed in Nazi Germany prior to and during World War II. The ammunition is also referred to as 7.9mm Kurz (German: Kurz meaning short), 7.9 Kurz, or 7.9mmK, or 8×33 Polte. It was specifically intended for development of an automatic carbine (assault rifle). The round was developed as a compromise between the longer 7.92×57mm rifle and the 9×19mm Parabellum pistol rounds, and is known as an intermediate cartridge (German: Mittelpatrone).

The 7.92×33mm Kurz has 2.22 ml (34.3 grains H₂O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in assault rifles under extreme conditions.

7.92×33mm Kurz maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).

Americans would define the shoulder angle at alpha/2 ≈ 17.5 degrees. The common rifling twist rate for this cartridge is 240 mm (1 in 9.45 in), 4 grooves, Ø lands = 7.89 millimetres (0.311 in), Ø grooves = 8.20 millimetres (0.323 in), land width = 4.40 millimetres (0.173 in) and the primer type is Berdan or Boxer (in large rifle size).

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Wikipedia