6.5×53mmR

6.5×53mmR
Military cartridge
Type	Military rifle cartridge
Place of origin	Austria-Hungary
Service history
In service	1893-1945
Used by	Netherlands Romania Kingdom of Portugal
Wars	Aceh War World War I World War II
Production history
Designed	1892
Specifications
Case type	Rimmed, bottleneck
Bullet diameter	6.65 mm (0.262 in)
Neck diameter	7.55 mm (0.297 in)
Shoulder diameter	10.75 mm (0.423 in)
Base diameter	11.48 mm (0.452 in)
Rim diameter	13.4 mm (0.53 in)
Rim thickness	1.25 mm (0.049 in)
Case length	53 mm (2.1 in)
Ballistic performance
Bullet mass/type Velocity Energy 159 gr (10 g) RN 2,433 ft/s (742 m/s) 2,050 ft·lbf (2,780 J)
Source(s): Rifles and Machine Guns .256 Mannlicher / 6.5x53R Reloading Data

The 6.5×53mmR or .256 Mannlicher is a late 19th-century rimmed centerfire military rifle cartridge similar to other early smokeless powder designs. It was the first of a series of 6.5-millimetre (0.26 in) Mannlicher cartridges and became the standard Romanian service rifle cartridge from 1893 to 1938, and the standard Dutch service rifle cartridge from 1895 to 1945.

Empty Dutch Mannlicher en-bloc clip

Comparison of .303 British with .256 Mannlicher