The '''6 mm Advanced Rifle Cartridge (ARC)''' (6×38mm), or '''6mm ARC''' for short, is a [[6mm caliber|6mm (.243) caliber]] [[fully powered cartridge|full-power]] [[rifle cartridge]] introduced by [[Hornady]] in 2020, as a low-[[recoil]], high-[[accuracy]] [[long range shooting|long-range]] [[cartridge (firearms)|cartridge]] designed aroundfor the [[AR-15]] platform.
The cartridge makes use of 6 mm (.243) [[bullet]]s, which are known for their high [[ballistic coefficient]]s due to beingthe relativelyhigh long[[sectional and thin,density]] which provides forwith less [[drag (physics)|drag]] and better [[kinetic energy|energy]] retention at extended ranges. With the release in 2020, Hornady also launched three factory loads with {{cvt|103|,|105|and|108|gr|g}} bullet weights and advertised G1 ballistic coefficients of .512, .530 and .536 respectively.<ref>[https://www.all4shooters.com/en/shooting/ammunition/hornady-6-mm-arc-new-ar-15-caliber-features/ Brand new rifle caliber: 6 mm ARC, Hornady's Advanced Rifle Cartridge! | all4shooters]</ref>
