6mm ARC
| 6mm Advanced Rifle Cartridge | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Place of origin | United States | |||||||||||||||
| Production history | ||||||||||||||||
| Manufacturer | Hornady | |||||||||||||||
| Produced | 2020–present | |||||||||||||||
| Specifications | ||||||||||||||||
| Parent case | .220 Russian/6.5mm Grendel | |||||||||||||||
| Case type | Rimless, bottleneck | |||||||||||||||
| Bullet diameter | 6.18 mm (0.243 in) | |||||||||||||||
| Neck diameter | 6.96 mm (0.274 in) | |||||||||||||||
| Shoulder diameter | 10.924 mm (0.4301 in) | |||||||||||||||
| Base diameter | 11.201 mm (0.4410 in) | |||||||||||||||
| Rim diameter | 11.20 mm (0.441 in) | |||||||||||||||
| Rim thickness | 1.5 mm (0.059 in) | |||||||||||||||
| Case length | 37.85 mm (1.490 in) | |||||||||||||||
| Overall length | 57.40 mm (2.260 in) | |||||||||||||||
| Case capacity | 2.20 cm3 (34.0 gr H2O) | |||||||||||||||
| Rifling twist | 190.5 mm (1:7.50 in) | |||||||||||||||
| Primer type | Small rifle | |||||||||||||||
| Maximum pressure (C.I.P.) | 380.00 MPa (55,114 psi) | |||||||||||||||
| Maximum pressure (SAAMI) | 358.53 MPa (52,000 psi) | |||||||||||||||
| Ballistic performance | ||||||||||||||||
| ||||||||||||||||
| Test barrel length: 610 mm (24 in) Source(s): | ||||||||||||||||
The 6mm Advanced Rifle Cartridge (6×38mm), or 6mm ARC for short, is a 6 mm (.243) caliber intermediate rifle cartridge introduced by Hornady in 2020, as a low-recoil, high-accuracy long-range cartridge, designed for use in the M16 platform at request of a specialized group within the U.S. DoD for its multipurpose combat rifle program. When compared to the military 5.56mm NATO platform, 6mm ARC is dimensionally incompatible regarding barrel, bolt and magazine components.