458 SOCOM Semi Auto Ammo — 650gr Maker REX SOCOM XL
Chattahoochee Munitions 458 SOCOM Semi Auto Ammo brings the extreme projectile weight of the 650-grain Maker REX to the CM10 large-frame semi-automatic platform. Loaded in factory-new Starline brass at an extended 2.790-inch overall cartridge length, this ammunition is developed specifically around the feeding, gas and cycling requirements of the CM10 458 SOCOM platform.
The 650gr Maker REX is an exceptionally long .458-caliber projectile measuring 2.035 inches. The SOCOM XL configuration provides the additional cartridge overall length needed to seat this projectile farther out of the case rather than forcing more of its length into the available case volume.
This is 458 SOCOM XL ammunition, but it does not use a different chamber. The chamber remains .458 SOCOM. XL describes the extended-length configuration made possible by a compatible firearm and magazine system.
458 SOCOM Semi Auto Ammo Developed for the CM10
Semi-automatic operation places different requirements on ammunition than a bolt-action firearm. The ammunition must not only produce the desired projectile performance; it must also provide the operating characteristics necessary to cycle the action reliably.
Chattahoochee Munitions developed this 458 SOCOM Semi Auto Ammo specifically around the CM10 operating system. Its propellant configuration is selected to provide the gas characteristics required for semi-automatic cycling while supporting the heavy 650gr Maker REX projectile.
Specific powder types, charge weights and other proprietary loading data are not published.
650gr Maker REX Expanding Projectile
The 650gr Maker REX expanding projectile is a precision CNC-machined, lead-free solid-copper projectile designed for expansion within its specified velocity range. Its exceptional length and weight make it particularly relevant to the extended-cartridge-length capability of SOCOM XL.
- Diameter: .458″
- Projectile Weight: 650 grains
- Projectile Length: 2.035″
- Construction: CNC-machined solid copper
- Lead Free: Yes
- Design: REX expanding
- Sectional Density: .443
- Ballistic Coefficient: .44
- Recommended Barrel Twist: 1:10
Why SOCOM XL Matters With a 650gr Projectile
The dimensions of the Maker REX illustrate the purpose of the SOCOM XL configuration. At 2.035 inches long, the projectile itself occupies substantial physical space. Staying within the conventional AR15 magazine envelope would require significantly more of that projectile to be seated inside the cartridge case.
This 458 SOCOM Semi Auto Ammo is loaded to an overall cartridge length of 2.790 inches, allowing the long Maker REX projectile to be seated farther out while remaining compatible with the feeding requirements of the CM10 SOCOM XL configuration.
The chamber does not get longer. The cartridge gets more room.
That distinction is fundamental to SOCOM XL. Explore the complete family of compatible firearms, magazines, ammunition and technical information at Terminal 458.
Factory-New Starline 458 SOCOM Brass
Each round of 458 SOCOM Semi Auto Ammo is assembled using factory-new Starline 458 SOCOM brass. Previously fired cases are not used.
New Starline brass and the CNC-machined Maker REX projectile provide the foundation for ammunition developed specifically around CM’s heavy-projectile SOCOM XL application.
Combined with the CNC-machined Maker projectile, new Starline brass provides a quality foundation for 458 SOCOM Semi Auto Ammo developed specifically around CM’s heavy-projectile SOCOM XL application.
Modified 458 SOCOM XL Magazine
The 2.790-inch overall cartridge length requires a firearm and feeding system capable of accepting extended-length ammunition. The CM10 uses a purpose-modified 458 SOCOM XL Magazine based on the MDT metal AICS magazine.
The modified magazine provides the additional usable cartridge length required by the SOCOM XL configuration while supporting the center-feed architecture of the CM10 platform.
The modified magazine provides the additional usable cartridge length necessary to accommodate extended-length SOCOM XL ammunition while working with the CM10’s center-feed architecture. This magazine and feeding architecture are fundamental to the extended cartridge length used by 458 SOCOM Semi Auto Ammo in the CM10 platform.
Designed for Semi-Automatic Operation
This load is specifically developed for the CM10 semi-automatic platform. Its ammunition configuration differs from the Chattahoochee Munitions bolt-action 650gr load because reliable semi-automatic operation requires the ammunition to work with the rifle’s gas and cycling system.
For compatible CM7S bolt-action firearms, Chattahoochee Munitions offers a separate 458 SOCOM Subsonic Ammo load using the same 650gr Maker REX projectile at a 2.802-inch overall cartridge length. The two loads should be treated as distinct products developed around their respective firearm platforms.
458 SOCOM Semi Auto Ammo Specifications
- Chamber Compatibility: .458 SOCOM
- Configuration: SOCOM XL
- Intended Platform: CM10 Semi-Automatic
- Projectile: Maker REX
- Projectile Weight: 650 grains
- Projectile Diameter: .458″
- Projectile Length: 2.035″
- Projectile Construction: CNC-Machined Solid Copper
- Cartridge Overall Length: 2.790″
- Brass: Factory-New Starline 458 SOCOM
- Recommended Twist: 1:10
- Magazine: Modified MDT AICS Magazine for SOCOM XL
- Operating Application: Semi-Automatic
Frequently Asked Questions
Is this 458 SOCOM Semi Auto Ammo designed for the CM10?
Yes. This load is developed specifically around the feeding, gas and cycling requirements of the Chattahoochee Munitions CM10 semi-automatic platform.
Does SOCOM XL require a different chamber?
No. The chamber remains .458 SOCOM. SOCOM XL refers to the additional cartridge overall length available through a compatible firearm and magazine system.
What is the overall cartridge length?
This CM10 semi-automatic load is assembled to an overall cartridge length of 2.790 inches.
Why is this load different from the CM bolt-action 650gr ammunition?
Semi-automatic operation requires ammunition developed around the gas and cycling requirements of the firearm. The CM10 load therefore uses a different propellant configuration from the bolt-action load. Specific powder and charge information is proprietary and is not published.
What magazine does this ammunition require?
The ammunition requires a firearm and magazine system capable of accepting its extended overall cartridge length. The CM10 uses a purpose-modified MDT AICS magazine configured specifically for SOCOM XL.
What barrel twist is recommended?
The 650gr Maker REX has a recommended 1:10 twist rate.
Is this the same ammunition as the 2.802-inch bolt-action load?
No. Both loads use the 650gr Maker REX and factory-new Starline brass, but they are separate products developed around different firearm operating requirements. The CM10 semi-automatic load is 2.790 inches OAL and is configured specifically for semi-automatic operation.
Where can I find the complete SOCOM XL product family?
Visit Terminal 458 to explore CM10 and CM7S firearms, SOCOM XL ammunition, magazines and related technical information.
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