6mm Musgrave
The 6mm Musgrave was a rifle cartridge invented by Ben Musgrave and introduced by Musgrave Rifles in 1969[1][2]
| 6mm Musgrave | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Rifle | |||||||||||||||||||
| Place of origin | South Africa | |||||||||||||||||||
| Production history | ||||||||||||||||||||
| Designer | Ben Musgrave | |||||||||||||||||||
| Designed | 1955 | |||||||||||||||||||
| Manufacturer | Musgrave Rifles | |||||||||||||||||||
| Specifications | ||||||||||||||||||||
| Parent case | .303 British | |||||||||||||||||||
| Case type | Rimmed, bottleneck | |||||||||||||||||||
| Bullet diameter | 0.243 (6mm) | |||||||||||||||||||
| Neck diameter | 0.338 in (8.6 mm) | |||||||||||||||||||
| Shoulder diameter | 0.401 in (10.2 mm) | |||||||||||||||||||
| Base diameter | 0.460 in (11.7 mm) | |||||||||||||||||||
| Rim diameter | 0.540 in (13.7 mm) | |||||||||||||||||||
| Rim thickness | .064 in (1.6 mm) | |||||||||||||||||||
| Case length | 2.222 in (56.4 mm) | |||||||||||||||||||
| Overall length | 3.075 in (78.1 mm) | |||||||||||||||||||
| Case capacity | 55.7 gr H2O (3.61 cm3) | |||||||||||||||||||
| Rifling twist | 1-10 inches | |||||||||||||||||||
| Primer type | Large rifle | |||||||||||||||||||
| Maximum pressure | 49,000 | |||||||||||||||||||
| Maximum CUP | 45,000 CUP | |||||||||||||||||||
| Ballistic performance | ||||||||||||||||||||
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| Test barrel length: 24" | ||||||||||||||||||||
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.
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) among them. However, a lot of 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..
See also
References
- "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.