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6mm Musgrave

Type

Rifle

Place of origin

South Africa

Production history

Designer

Ben Musgrave Jnr

Designed

1955

Manufacturer

Musgrave

Specifications

Parent case

.303 British

Case type

Rimmed, bottleneck

Bullet diameter

0.243 in (6mm)

Neck diameter

0.271 in (6.9mm)

Shoulder diameter

0.4008 in (10.2mm)

Base diameter

0.4598 in (11.68mm)

Rim diameter

0.5378 in (13.7mm)

Rim thickness

0.0642 in (16.3mm)

Case length

2.2083 in (56.1mm) / (trim length = 2.1983 in (55.84mm))

Overall length

2.8606 in (72.6mm)

Case capacity

49.9 gr H₂O (3.23 cm)

Rifling twist

1-10 inches

Primer type

Large rifle

Maximum pressure

46,500

Maximum CUP

45,000 CUP

Ballistic performance

Bullet mass/type	Velocity	Energy
80 gr (5 g) SP	3,120 ft/s (950 m/s)	1,729 ft⋅lbf (2,344 J)
85 gr (6 g) SP	3,084 ft/s (940 m/s)	1,795 ft⋅lbf (2,434 J)
90 gr (6 g) SP	2,950 ft/s (900 m/s)	1,739 ft⋅lbf (2,358 J)
100 gr (6 g) SP	2,805 ft/s (855 m/s)	1,747 ft⋅lbf (2,369 J)

Test barrel length: 24"

The 6mm Musgrave was a rifle cartridge invented by Ben Musgrave and introduced by Musgrave in 1969

The cartridge's design is based on necking down the .303 British, with the original intent of it being a Springbok caliber for hunting on open plains in South Africa's Karoo, Kalahari and Namakwaland. It also served as a modern cartridge suitable for converting many old Lee-Enfields with worn out .303 barrels.

Like the .243 Winchester, it has a fast rifle twist of 1-10 inches. However, if 105 grain bullets are used, it is recommended that a 1-9 or even faster twist is used to stabilize the bullets.

Very few manufacturers specifically create 6mm Musgrave rounds, with PMP (Pretoria Metal Pressings) method. However, many South African distributors have the ammunition in stock.

Most bullet manufacturers offer 6mm (.243") bullets that are suitable for use with rifles chambered in 6mm Musgrave.

References

^ Robertson, Karen, ed. (Spring 2004). "Ben Musgrave" (PDF). NRA Journal. LXXXIII (1). National Rifle Association: 53. ISSN 0028-0070. Retrieved 2 November 2023.
"6mm MUSGRAVE | Cartridgecollector.net". www.cartridgecollector.net. Retrieved 2020-07-27.
"R A Dynamic - Guns and Ammunition Distributor - 243- 6mm Musgrave". www.radynamic.co.za. Retrieved 2020-07-27.

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References