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| design_date =
| manufacturer = [[Hornady]]
| production_date =
<!-- Specifications -->
| is_SI_specs = yes
| parent = [[.220 Russian]]/6.5mm Grendel<ref
| case_type = Rimless, bottleneck
| bullet = 6.18
| bullet_ref = <ref name="6mm-ARC-drawings">
| neck = 6.96
| neck_ref = <ref name="6mm-ARC-drawings"/>
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The cartridge makes use of 6 mm (.243 in) [[bullet]]s, which are known for their high [[ballistic coefficient]]s due to the high [[sectional density]] with 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>
The 6mm ARC is a medium-power cartridge comparable to the [[6.5mm Grendel]], but with better ballistics thanks to the greater muzzle velocity achieved by using lighter 6
In addition to the above comments there is some confusion regarding the 6
For example, the data in the Hornady 11th Edition Manual for an 18 in (457
== SAAMI spec ==
== Compatibility with the AR-15 ==
For an ordinary AR-15 rifle chambered for the [[.223 Remington|.223 Rem]]/[[5.56mm NATO]], a new [[gun barrel|barrel]], [[magazine (firearms)|magazine]] and [[bolt (firearms)|bolt]] are required to convert to the 6mm ARC.<ref>[https://www.gunsamerica.com/digest/hornadys-new-6mm-arc-odin-works-barrels-first-field-tests/ Hornady's NEW 6mm ARC & Odin Work's Barrels - www.gunsamerica.com]</ref> The 6mm ARC utilizes the same bolt head size as the [[6.5mm Grendel]], and 6.5mm Grendel-compatible [[STANAG magazine|AR-pattern]] [[box magazine]]s have also been used successfully with the 6mm ARC.<ref>[https://gununiversity.com/6mm-arc-review/ gununiversity.com | 6mm ARC Released / Hands-On Testing and Comparisons, by Ryan Cleckner 3 June 2020]</ref> The 6mm ARC therefore can also be a suitable chambering for shorter "mini-action" [[bolt-action rifle]]s.{{
== See also ==
* [[.223 Remington]]
* [[6mm AR]]
* [[6 PPC]]
* [[6.5mm Grendel]]
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