.242 Rimless Nitro Express

The .242 Rimless Nitro Express, also known as the .242 Vickers and initially called the .242 Manton, was a rimless bottleneck centerfire rifle cartridge developed by Kynoch for J. Manton & Co of Calcutta and introduced in 1923.^[1][2]

.242 Rimless Nitro Express
Type	Rifle
Place of origin	United Kingdom
Production history
Designer	Kynoch
Designed	1923
Produced	1923–present
Specifications
Case type	Rimless, bottleneck
Bullet diameter	.253 in (6.4 mm)
Neck diameter	.281 in (7.1 mm)
Shoulder diameter	.405 in (10.3 mm)
Base diameter	.465 in (11.8 mm)
Rim diameter	.465 in (11.8 mm)
Case length	2.38 in (60 mm)
Overall length	3.2 in (81 mm)
Primer type	.217/54
Ballistic performance
Bullet mass/type Velocity Energy 100 gr (6 g) 2,800 ft/s (850 m/s) 1,740 ft⋅lbf (2,360 J)
Source(s): Cartridges of the World.[1]

The .242 Rimless is very similar to the .243 Winchester in performance, although the cartridge is significantly longer. It fired a 100 gr projectile at 2800 fps.^[1][2]

.242 Vickers Performance Comparison

Cartridge	Bullet weight	Muzzle velocity	Muzzle energy
.242 Rimless Nitro Express	100 gr (6.5 g)	2,800 ft/s (850 m/s)	1,740 ft⋅lbf (2,360 J)
.240 Apex	100 gr (6.5 g)	2,900 ft/s (880 m/s)	1,865 ft⋅lbf (2,529 J)
.240 Weatherby Magnum	100 gr (6.5 g)	3,406 ft/s (1,038 m/s)	2,576 ft⋅lbf (3,493 J)
.243 Winchester	100 gr (6.5 g)	2,960 ft/s (900 m/s)	1,945 ft⋅lbf (2,637 J)
.243 Winchester Super Short Magnum	100 gr (6.5 g)	3,110 ft/s (950 m/s)	2,147 ft⋅lbf (2,911 J)
.244 H&H Magnum	100 gr (6.5 g)	3,500 ft/s (1,100 m/s)	2,720 ft⋅lbf (3,690 J)
.246 Purdey	100 gr (6.5 g)	2,950 ft/s (900 m/s)	1,930 ft⋅lbf (2,620 J)
6 mm Lee Navy	100 gr (6.5 g)	2,680 ft/s (820 m/s)	1,595 ft⋅lbf (2,163 J)
6 mm Remington	100 gr (6.5 g)	3,100 ft/s (940 m/s)	2,133 ft⋅lbf (2,892 J)

See also

• Nitro Express
• List of rifle cartridges
• 6mm rifle cartridges