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{{Short description|American rifle cartridge by Hornady}}
{{Infobox firearm cartridge
| name =
| image = Rifle cartridges (l. to r.) .308 Win, 6mm ARC, 300 AAC, .223 Rem.jpg
| alt = Rifle cartridges (l. to r.) .308 Win, 6mm ARC, 300 AAC, .223 Rem
| caption = Rifle cartridges (l. to r.) .308 Win, 6mm ARC, 300 AAC, .223 Rem
| type = Centerfire rifle
| origin = [[United States]]
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| design_date =
| manufacturer = [[Hornady]]
| production_date =
<!-- Specifications -->
| is_SI_specs = yes
| parent = [[
| 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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| base = 11.201
| base_ref = <ref name="6mm-ARC-drawings"/>
| rim_dia =
| rim_dia_ref = <ref name="SAAMI">[[SAAMI]] (2020): [https://saami.org/wp-content/uploads/2021/06/6mm-ARC-Public-Introduction-Rev-2020-07-29.pdf 6mm Advanced Rifle Cartridge [6mm ARC<nowiki>]</nowiki>]. Retrieved 2023-01-16.</ref>
| rim_thick = 1.5
| rim_thick_ref = <ref name="firearmsnews">[https://www.firearmsnews.com/editorial/new-from-hornady-6mm-arc/376909 Hornady 6mm ARC Cartridge - What You Need to Know]</ref>
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| case_capacity = 2.20
| case_capacity_ref = {{citation needed|date=July 2020}}
| rifling = 190.5 mm (1:7.50
| primer = Small rifle
| max_pressure = 358.53
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| balsrc = <ref name="Hornady-6mm-ARC-info-page">[https://www.hornady.com/6mmarc 6mm ARC - Hornady Manufacturing, Inc]</ref>
}}
The '''
== Performance ==
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 mm bullets and enough power to make use of the heavy 6 mm bullets. Some have stated that it offers comparable ballistics to larger 6 mm cartridges like the 6mm Creedmoor and [[.243 Winchester]], but out of a smaller cartridge, however this simply is not true when comparing muzzle velocities between them.<ref>{{cite web|url=https://www.loaddevelopment.com/6mm-creedmoor-hunt-and-competition/|title=6mm ARC vs 6mm Creedmoor|website=loaddevelopment.com}}</ref> What the 6mm ARC does offer though is almost comparable velocities and ballistic performance, but out of a compact cartridge that has less perceived recoil and fits into the standard [[AR-15]] length actions.
== Compatibility with the AR-15 ==▼
For an ordinary AR-15 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 AR-magazines 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 can also be a suitable chambering for shorter "mini-action" [[bolt action]] rifles.▼
In addition to the above comments there is some confusion regarding the 6 mm ARC's performance. This is because loading data given in some manuals such as the ''11th Edition Hornady Reloading Manual'',<ref>[https://www.hornady.com/reloading/handbook Hornady 11th Edition Reloading Manual]</ref> for example, has two sets of data. The first set of data is loaded to the SAAMI maximum average pressure (MAP) of 52,000 psi, which is stated to be suitable for gas-operated firearms such as the AR-15 platform and its derivatives. The second set of data is loaded to a MAP of 62,000 psi, which is stated to be for use with bolt action guns such as the [[CZ 527]]. The Hornady manual states that this second set of data should not be used in gas-guns. Due to the lower MAP, the performance of 6mm ARC ammunition loaded to gas-gun pressures will, on average, be less than firearms loaded to bolt action pressures when using the same barrel length. When using shorter barrels, which are common on gas-guns, the difference will be even more pronounced.
For example, the data in the Hornady 11th Edition Manual for an 18 in (457 mm)-barrelled AR-15 platform firearm was on average 200–300 ft/s (60–90 m/s) less than the data for the 24 in (610 mm)-barrelled CZ 527 bolt action rifle.
== 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-
== See also ==
* [[.223 Remington]]
* [[6mm AR]]
* [[6 PPC]]
* [[6.5mm Grendel]]
== References ==
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