6 mm XC

6mm XC (also known as 6XC) is a "wildcat" rifle cartridge, similar to the 6x47mm Swiss Match.

6mm XC
TypeRifle
Place of originUnited States
Production history
DesignerDavid Tubb
ManufacturerCommercially by Norma
Specifications
Parent case.250 Savage
Case typeRimless, Bottleneck
Bullet diameter6.17 mm (0.243 in)
Neck diameter6.82 mm (0.269 in)
Shoulder diameter11.42 mm (0.450 in)
Base diameter11.84 mm (0.466 in)
Rim diameter11.86 mm (0.467 in)
Rim thickness1.22 mm (0.048 in)
Case length48.1 mm (1.89 in)
Overall length63.4 mm (2.50 in)
Case capacity3.24 cm3 (50.0 gr H2O)
Primer typelarge rifle
Ballistic performance
Bullet mass/type Velocity Energy
95 gr (6 g) Nosler Ballistic Tip 2,953 ft/s (900 m/s) 1,840 ft⋅lbf (2,490 J)
95 gr (6 g) Norma Jaktmatch FMJ 2,953 ft/s (900 m/s) 1,840 ft⋅lbf (2,490 J)
100 gr (6 g) Norma Oryx Bonded SP 2,953 ft/s (900 m/s) 1,937 ft⋅lbf (2,626 J)
Source(s): Norma[1]

History

The 6mm XC was initially developed specifically for NRA High Power match shooting by 11-time NRA High Power National Champion David Tubb. It is touted as being one of the most accurate long-range 6 mm rounds in the world that is designed for repeating rifles.

Originally, the case for this wildcat had to be formed from .250 Savage brass, but it is now commercially available.

Performance

The 6XC is a 1000-yard cartridge, comparable to benchrest calibers such as 6x47mm Swiss Match, 6.5×47mm Lapua and 6 mm/22-250; it fits into cartridge class that exceeds the velocities of benchrest calibers such as 6mm BR Remington, 6mm BRX and 6mm Dasher. The 6XC has claimed several wins in NRA High Power National Championships and a number of NRA Long Range championship events (1000 yard events).

Muzzle velocity
  • 7.45 g (115 gr) Hollow Point Boat Tail (HPBT): 3,000 ft/s (910 m/s)
gollark: TLC does three bits a cell, so you get 2³ = 8 voltage levels, etc. - you trade off endurance and speed for density.
gollark: The issue with it is that the flash memory wears down in some way after a bunch of program/erase cycles, so it has trouble reading/writing accurately or something, and this is a greater problem for MLC than SLC because it has to read finer gradations.
gollark: I mean, yes, the naming is weird.
gollark: MLC is two bits a cell, so it has to distinguish *four* voltage levels. This means you get twice the density.
gollark: SLC flash stores only one bit per cell, so it needs to distinguish two voltage levels.

See also

References
  1. Norma 6XC Oryx data sheet. Retrieved 8 April 2013.


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