Of all the cartridges on this site, the 6mm ARC is the one where the move to the AR platform is actually visible in the rifles rather than only in the marketing.
It is Hornady’s, built to the AR-15’s magazine box, and unlike its stablemates it has semi-automatics chambered for it. It has also done something stranger: the bolt rifles have gone AR too. Seven of the twelve feed from a ten-round AR-pattern magazine, and most wear a barrel of AR length.
The cartridge that actually reached the platform
Hornady designed both ARC cartridges around the AR-15 — in their words, a cartridge that “fits into your AR-15 but is equally at home in a bolt action”. For the 22 ARC that has not happened yet: this catalog lists six rifles and not one is a semi-automatic. The 6mm ARC has two.
Search behavior says the same thing more loudly. The busiest term for this
cartridge is not the rifle — it is 6mm arc upper, people building their own
AR uppers, which outruns 6mm arc rifle by half again. This is a cartridge people
are assembling rather than buying whole.
Bolt rifles
| Rifle | Barrel | Twist | Weight | Capacity |
|---|---|---|---|---|
| Christensen Arms MPR Competition Tungsten Cerakote Bolt Action Rifle - 26i | 26in | 1:7.5 | 11.6 lb | 10+1 |
| Ruger American Generation II Predator Burnt Bronze Cerakote Bolt Action Ri | 22in | 1:7.7 | 6.7 lb | 10+1 |
| CVA Scout Takedown Stainless Steel Single Shot Rifle | 20in | — | — | 1 |
| Ruger American Generation II Gun Metal Gray Cerakote Bolt Action Rifle - 2 | 20in | 1:7.7 | 6.5 lb | 10+1 |
| Savage Arms Axis 2 PRO Bronze Cerakote/Forest SP Camo Bolt Action Rifle - | 20in | 1:7.5 | 6.8 lb | 4 |
| Proof Research Elevation MTR 2.0 Green Jungle Camo Bolt Action Rifle - 18i | 18in | 1:7.5 | 6.8 lb | 5+1 |
| Proof Research Elevation MTR 2.0 Green Jungle Camo Left Hand Bolt Action R | 18in | 1:7.5 | 6.8 lb | 5+1 |
| CVA Scout XP SB Graphite Black Single Shot Rifle | 16.5in | 1:7.5 | 6.5 lb | 1 |
| Ruger American Rifle Generation II Ranch Cobalt Cerakote Bolt Action Rifle | 16.1in | 1:7.7 | 6.7 lb | 10+1 |
| Christensen Arms MPR Black Anodized Bolt Action Rifle | 16in | 1:7.5 | 6.9 lb | 10+1 |
| Christensen Arms MPR Desert Brown Cerakote Bolt Action Rifle | 16in | 1:7.5 | 6.9 lb | 10+1 |
| Christensen Arms MPR Tungsten Cerakote Bolt Action Rifle | 16in | 1:7.5 | 6.9 lb | 10+1 |
Two things stand out. 7 of the twelve are ten-round AR-magazine rifles — Christensen’s MPR, Ruger’s Generation II, the CVA — which is a bolt action built around a semi-automatic’s feed. And the makers are not the usual varmint names: Christensen Arms and Proof Research are carbon-barrel specialists, and their presence tells you where the cartridge sits in the market. Ruger’s Generation II is the one affordable way in.
Semi-automatics
| Rifle | Barrel | Twist | Weight | Capacity |
|---|---|---|---|---|
| Diamondback DB15 Obsidian 18in Black Hardcoat Anodize Semi Automatic Moder | 18in | 1:7.5 | 6.8 lb | 26+1 |
| Lantac LA-SF15 Anodized Black Semi Automatic Modern Sporting Rifle - 17+1 | 18in | — | — | 17+1 |
Two rifles, both 18 inch, which is longer than the 16 inch the .223 AR market standardized on. That is the cartridge asking for barrel and getting a little of it.
The barrel problem
Every rifle here runs a fast twist — 1:7.5 or 1:7.7 — which is right, because the 6mm ARC exists to shoot long, high-BC bullets, and the load data runs to 103, 105 and 108 grain.
The difficulty is at the other end. Hornady’s published velocities come from a 24 inch barrel. Of the fourteen rifles here, one is 26 inch, one is 22, three are 20, and the rest are 18 inch or shorter — including three Christensen MPRs at 16 inch and a Ruger Ranch at 16.1.
So the numbers on the box were not measured in the rifle most people will buy. A cartridge designed around a magazine length, sold in barrels chosen for handiness, and quoted from a tube longer than either. That is worth knowing before comparing its figures against a .22-250’s.
For coyotes, honestly
The 6mm ARC is a very good cartridge that is not really aimed at you. Look at the application column on the load data: of the five factory loads, two are match, two are hunting, and one is a varmint load. It was built for deer at sensible ranges and for shooting competitively out of a gas gun.
It will kill coyotes and it will do it well past where a .223 has given up. But you will be shooting a 103 grain bullet at fur, out of a 16 or 18 inch barrel, and paying for a carbon-barrelled rifle to do it. If the fur matters, the .204 or a fast-twist .22-250 is the more direct answer.
How this was checked
The fourteen rifles were listed in a major US retailer’s catalog on 4 September 2026, across both its bolt-action and semi-automatic categories, with barrel, twist, weight and capacity taken from that retailer’s published specification. Empty cells are figures it does not publish.
A catalog listing is not a stock check, and this is one retailer — an AR-focused seller would show more semi-automatics than two.
No paid links. The rifle tables here are editorial. For choosing between cartridges rather than rifles, start at the hub.