6 mm XC

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

6mm XC
6 mm XC cartridge
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 as a Wildcat cartridge specifically for NRA High Power match shooting by 11-time US National Champion David Tubb.[2][3] The round originated from chambering a barrel using a .243 Winchester reamer held short, with the case reformed from .22-250.[2] The round is optimised for bullets heavier than 100 grains to improve performance at long ranges - .243Win typically uses bullets lighter than 100 grains.[4] It is touted as being one of the most accurate long-range 6 mm rounds in the world that is designed for repeating rifles.

The 6XC is now a CIP standardized case.[5] The origin is listed as Sweden since Norma standardised the case. Factory brass is available from Norma and Peterson.[6]

Performance
6 mm XC diagram in Inches

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. David Tubb has claimed several wins with the 6XC 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)

See also

References
  1. Norma 6XC Oryx data sheet. Retrieved 8 April 2013.
  2. "6XC Cartridge Guide". 6mmbr.com. Archived from the original on 10 December 2004. Retrieved 4 May 2023.
  3. German A. Salazar (May 2007). "6XC for Competitive Shooting". AccurateShooter.com. Archived from the original on 13 May 2011. Retrieved 4 May 2023.
  4. Peter Jones (18 August 2015). "6mm XC Norma". Country Deer Stalking. Archived from the original on 25 October 2020. Retrieved 4 May 2023.
  5. "6XC - Table of Dimensions of Cartridges and Chamber" (PDF). Commission Internationale Permanente (C.I.P.) pour l'épreuve des armes à feu portatives. 8 April 2015. pp. PDF. Archived (PDF) from the original on 7 May 2021. Retrieved 4 May 2023.
  6. Vince Bottomley (20 April 2015). "Wildcats I Have Known and Loved – the 6XC". Target Shooter. Archived from the original on 5 December 2018.


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