Both cartridges were standardized by SAAMI in January 2024. Both fire a .224-inch bullet. Both were pitched to hunters as a way to get .22-250 trajectory without .22-250 barrel wear. Yet the 22 ARC and the 22 Creedmoor reach that goal from opposite directions, which is why the right answer depends almost entirely on the rifle you want to end up holding.
The 22 ARC is a necked-down 6.5 Grendel. Case capacity is about 34.6 grains of water, maximum cartridge length is 2.260 inches, and SAAMI specifies a 1 in 7 twist. The 22 Creedmoor is a 6.5 Creedmoor case squeezed to .224, holding roughly 52.6 grains of water, with a 2.700-inch maximum length and a 1 in 8 twist.
That single number, case capacity, drives everything downstream: velocity, pressure, barrel life, action size, magazine fit, and how much powder leaves the barrel with every shot.
SAAMI lists the 22 ARC at 52,000 psi maximum average pressure and the 22 Creedmoor at 62,000 psi. Those figures are not arbitrary. The ARC was designed to run in an AR-15, and the limiting factor there is bolt thrust on a small bolt face. All factory 22 ARC ammunition is loaded to that 52,000 psi ceiling so it does not beat up gas-gun bolts.
Put the same cartridge in a bolt action and a handloader can work up to 60,000 to 62,000 psi. In Outdoor Life's 3,000-round comparison, Tyler Freel measured that as roughly 100 to 250 fps of extra muzzle velocity. It is the quiet advantage of the ARC that most buyers never hear about.
In that same side-by-side test, 80 grain ELD-X bullets from 24-inch barrels left the 22 Creedmoor at 3,285 fps and the 22 ARC at 3,010 fps. Hornady's light-bullet ARC load, the 62 grain ELD-VT V-Match, is listed at 3,300 fps from a 24-inch test barrel, which tells you the ARC's speed comes from a lighter bullet rather than a bigger case.
The Creedmoor pulls away where distance matters. Its 80 grain loads carry a much higher ballistic coefficient than anything the ARC can drive at the same speed, so they drift less in wind and hold energy further out. That is why the 22 Creedmoor is a defensible antelope and deer cartridge at 400 yards while the ARC is a coyote and varmint round that happens to be capable beyond that.
Here is where the ARC claws back ground. Freel expects 2,000 to 3,000 rounds from a 22 ARC barrel. Derrick Ratliff of Horizon Firearms told him most 22 Creedmoor barrels are done between 1,200 and 1,900 rounds. The Creedmoor burns something like 44 grains of slow powder per shot against the ARC's mid-30s, so it makes more heat and eats throat steel faster.
Ammunition pricing follows the same curve, and 22 ARC ammunition is generally meaningfully cheaper than 22 Creedmoor. If you are feeding a prairie dog town all weekend, that math outranks 200 fps. Bulk .223 Remington is still the cheapest practice of all, but the ARC closes the gap once you start shooting past 300 yards.
The ARC's party trick is the AR-15. A barrel and a 6.5 Grendel bolt face is the whole conversion on a lower you already own, though magazines are the weak point: Grendel-pattern magazines work, dedicated metal ARC magazines from MDT work well, but flush-fit AICS options are thin and the case is undersized for a standard short action.
The 22 Creedmoor is the opposite. Standard short action, standard .308 bolt face, standard magazines, no custom bolt and no spacer games. Bolt-action shooters who want plug-and-play should weight that heavily.
Choose the 22 ARC if you want an AR-15 that hits harder and flatter than 5.56, if you shoot high volume, if you handload, or if barrel replacement cost is a real budget line. Choose the 22 Creedmoor if you want one bolt rifle for varmints through deer, if you only shoot factory ammunition, or if standard magazines and a standard action matter more to you than round count.
Optics deserve the same care as the cartridge. A 22 ARC gas gun is a natural thermal host, because the round exists largely because night hunters wanted .22-250 trajectory out of an AR, so the 384 versus 640 thermal comparison is worth reading before you spend. A 22 Creedmoor bolt gun used in daylight wants a proper hunting scope instead, and the EOTech VUDU 4-12x36 is one option worth a look.
Either way the rifle arrives through a licensed dealer, so line up the transfer before you order. If you are in Texas, you can find an FFL dealer in Texas to handle the paperwork and the background check.
The last point worth making is that the headstamp matters less than the bullet and the twist. A 1 in 7 ARC shooting an 88 grain ELD-M will beat a poorly matched Creedmoor load at distance, and a 22 Creedmoor fed 62 grain varmint bullets is just an expensive .22-250. Match the bullet to the twist first, then match the cartridge to the platform you actually want to carry.