What’s in your chamber? The hybrid CMMG Resolute .458 SOCOM is designed to bring 600 grains of punch to the hunt. Whether you’re defending your family or looking to bring home the bacon (and all the other cuts), the .458 SOCOM RESOLUTE keeps going when you need it most.
CMMG’s RESOLUTE is the perfect choice for this big caliber. The .458 SOCOM achieves optimum ballistic performance in the 16-inch barrel providing great balance, accuracy, and maneuverability.
The RESOLUTE lineup is available in three tiers: RESOLUTE 100, RESOLUTE 200 and RESOLUTE 300, each customized to give you the features you want at the price you need.
The CMMG 458 Socom is a beefy rifle. The hybrid receivers, the .458 barrel, and the .458 bolt are fat where it counts. At only 7 lbs 4oz, the Resolute is quite comfortable to shoot.
The CMMG Mid-sized hybrid receivers are NOT compatible with standard AR-15 (CMMG Mk4) or .308 WIN (CMMG Mk3) uppers.
Resolute™ 200 .458 SOCOM
- BARREL: 16.1″, 1:14 twist, Medium Taper, 416SS
- MUZZLE: CMMG SV Brake, threaded 5/8-32
- GAS PORT: Carbine Length with SLR Adjustable Gas Block
- RECEIVER: Billet 7075-T6 AL Mid Size upper, Billet 7075-T6 AL Lower
- HANDGUARD: CMMG RML15 M-Lok handguard
- FINISH: Hard Coat Anodized Receivers and Hand Guard (Upgrade to Cerakote)
- CHARGING HANDLE: CMMG Standard Mid-Size
- PISTOL GRIP: Magpul MOE
- BUTTSTOCK: CMMG RipStock with 6 Position Enhanced Receiver Extension and Ambi Sling Plate
- TRIGGER: CMMG Single stage mil-spec style trigger
- TRIGGER GUARD: Integrated Into Lower
- SAFETY SELECTOR: CMMG Mil-Spec
- MAGAZINE: Ten round CMMG Modified Lancer Magazine
- WEIGHT: 7 lbs 4oz (unloaded)
- LENGTH: 33.3″(stock collapsed)
- Ships with two CMMG Modified Lancer Magazines
The Resolute lower receiver is generous for rapid reloads. It will accept any AR 15 magazine. The Lancer magazines provided have metal feed lips and have been modified to increase reliability with the .458 SOCOM. I used several magazines from favorite brands. Mission First Tactical magazines, MAGPUL, and GI aluminum mags. All of them worked great.
The .458 SOCOM cartridge was designed to be compatible with the AR platform. This included the buffer, buffer spring, GI magazines, many aftermarket .223/5.56 magazines, and magazine well.
In a .223/5.56 AR magazine, cartridges are staggered in a double stack. With the larger .458 SOCOM, rounds single stack with no modification to the standard AR magazine feed lips or followers. A 20-round 5.56mm NATO magazine can hold seven .458 SOCOM rounds and a 30-round 5.56mm NATO magazine can hold ten .458 SOCOM rounds.
I was able to shoot two hundred rounds in three different .458 SOCOM loads. The SBR Ammunition 300gr Solid Brass and 500gr Round nose subsonic loads as well as the ARX 200gr Interceptor.
Each of these loads cycled well. The groups were very consistent at 100 yards. The best 5 round groups measured just under 4 inches.
The .458 SOCOM (11.63×40mm) promises the ballistics of the legendary .45-70 in the AR platform rifle. The .458 launches 250 to 600 grain .458 caliber bullets with manageable recoil.
Building an AR in .458 SOCOM requires a .458 specific bolt and barrel. The ejection port opening of the upper receiver must be extended to allow clearance for the larger cartridge.
The .458 SOCOM feeds from most standard unmodified 5.56 AR magazines. CMMG provides Lancer L5 AWM magazines. The Lancer 20 round 5.56 magazine holds seven SOCOM rounds and the 30 round 5.56 magazine will hold nine.
The .458 round has a reputation for breaking guns. It has been said “The .458 round is well suited for stopping an intruder. In your neighbor’s house. Behind a refrigerator.” Immensely powerful, yes it is, but CMMG has built a rifle that runs it.
For hunting medium to large game, 250 grain– 400-grain bullets are very effective. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbs (3,261 J), similar to a light .45-70 but with a much smaller case.
The 458 SOCOM cartridge
The Resolute’s 1-14 twist barrel is a great choice to use with a suppressor. The SOCOM will launch 500- 600-grain bullets at subsonic velocities for suppressed or tactical use.
Nikon FORCE1000 1-4x24mm Riflescope. with the SPEEDFORCE Illuminated reticle.Nikon’s Black Force 1000 1-4X IL is the perfect pairing for the CMMG .458 SOCOM. The 1 X 4 power scope allows quick transition from close range to distant targets and back.
The SPEEDFORCE Illuminated reticle uses a double horseshoe design for making precise shots out to mid-ranges without over-magnifying your target and provides moving-target leads with quick target acquisition. Side-mounted illumination adjustment lets you select from 10 different intensity settings to precisely meet ambient lighting conditions.
Photos by Mark Miller