CM7S .458 SOCOM 16″ Rifle

Purpose-Built 458 Caliber Bolt Action Rifle

The Chattahoochee Munitions CM7S .458 SOCOM 16″ Rifle is a purpose-built 458 Caliber Bolt Action Rifle designed around the capabilities of extremely heavy .458-caliber projectiles and the extended cartridge overall length available through the .458 SOCOM XL configuration.

Built on the CM7S short-action platform and chambered in .458 SOCOM, this rifle can take advantage of additional cartridge overall length beyond the traditional AR-15 magazine envelope. This provides greater flexibility when loading the long, heavy .458-caliber projectiles that make the platform particularly well suited to suppressed and subsonic applications.

At the heart of this 458 Caliber Bolt Action Rifle is a 16-inch Mos-Tek barrel with a fast 1:10 twist rate, providing the rotational stability required for exceptionally heavy .458-caliber projectiles.

The complete CM7S feeds from genuine MDT metal AICS-pattern magazines modified by Chattahoochee Munitions specifically for the dimensions and feeding requirements of extended-length .458 SOCOM ammunition.

For shooters looking beyond a conventional large-bore rifle, the CM7S combines heavy-projectile capability with the accuracy, simplicity and versatility of a purpose-built bolt-action platform.

Explore the complete Chattahoochee Munitions .458 SOCOM ecosystem—including CM7S and CM10 firearms, ammunition, magazines and technical information—at Terminal 458.

Why Choose a 458 Caliber Bolt Action Rifle?

A large-bore bolt-action platform provides an excellent foundation for taking advantage of extremely heavy .458-caliber projectiles.

Traditional .458 SOCOM applications are commonly associated with the AR-15 platform. While that provides a proven large-bore option for the AR-15, the magazine architecture also establishes a practical limit on cartridge overall length.

The CM7S SOCOM XL configuration moves beyond that magazine-length constraint without changing the .458 SOCOM chamber.

By utilizing the CM7S short-action platform and an AICS-pattern magazine architecture, this 458 Caliber Bolt Action Rifle provides additional usable cartridge overall length for long, heavy .458-caliber projectiles.

Instead of designing the rifle around the dimensional limitations of an AR-15 magazine, Chattahoochee Munitions uses the additional room available in the CM7S platform to support extended-length .458 SOCOM ammunition.

The chamber doesn’t get longer. The cartridge gets more room.

The 458 Caliber Bolt Action Rifle uses that additional cartridge-length capability while retaining the established .458 SOCOM chamber and cartridge case.

16″ Mos-Tek Barrel with 1:10 Twist

The CM7S uses a Mos-Tek 16-inch .458 SOCOM barrel manufactured from 416R stainless steel with 5R rifling and a fast 1:10 twist.

Projectile stabilization becomes increasingly important as projectile weight and length increase. The 1:10 twist rate used in this 458 Caliber Bolt Action Rifle supports the long, heavy projectiles associated with the .458 SOCOM XL application.

The 16-inch barrel provides a balance between barrel length, handling and overall package size while maintaining the specialized heavy-projectile capabilities that define the platform.

Barrel Specifications

• Chambering: .458 SOCOM
• Manufacturer: Mos-Tek
• Length: 16″
• Material: 416R Stainless Steel
• Rifling: 5R
• Twist Rate: 1:10
• Crown: Shouldered Crown
• Muzzle Threads: 11/16×24
• Barrel System: Remage
• Finish: E100 Blackout Cerakote

TriggerTech Primary Trigger

The CM7S comes standard with a TriggerTech Primary Remington 700 trigger. Customers can select either a flat or curved trigger shoe.

The TriggerTech Primary is adjustable from 1.5 to 4.0 pounds and uses TriggerTech’s Frictionless Release Technology. Chattahoochee Munitions sets the trigger at approximately 1.5 pounds for this configuration.

What 458 SOCOM XL Means

The defining characteristic of SOCOM XL is not a different chamber. The CM7S remains chambered in .458 SOCOM.

SOCOM XL describes the extended cartridge overall-length capability made possible when .458 SOCOM is used in compatible firearm and magazine systems that are not confined to the traditional AR-15 magazine envelope.

That additional usable length provides greater flexibility when working with exceptionally long and heavy .458-caliber projectiles. A long projectile can be seated farther out rather than requiring the same degree of deep seating necessary to remain within a shorter magazine-length constraint.

For shooters considering a 458 Caliber Bolt Action Rifle specifically because of its heavy-projectile potential, the CM7S provides a platform configured around those capabilities from the beginning.

Modified MDT Metal Magazine System

The complete CM7S uses a genuine MDT metal AICS-pattern magazine modified by Chattahoochee Munitions for the SOCOM XL application.

The modified magazine provides the usable cartridge length and feeding configuration required by the extended-length .458 SOCOM ammunition used in complete Chattahoochee Munitions SOCOM XL firearms.

This magazine system allows the 458 Caliber Bolt Action Rifle to take advantage of the additional cartridge overall length available in the CM7S short-action platform.

Chattahoochee Munitions also uses the modified MDT magazine architecture in the CM10 large-frame semi-automatic .458 SOCOM platform, allowing both branches of the Terminal 458 ecosystem to support SOCOM XL ammunition configured for their respective operating systems.

Designed Around Heavy Subsonic .458 SOCOM

The CM7S platform is particularly well suited to suppressed and subsonic applications.

Unlike a semi-automatic action, the bolt action does not depend on ammunition generating sufficient gas to cycle the firearm. This allows bolt-action ammunition to be developed around the projectile and intended ballistic application without simultaneously satisfying semi-automatic cycling requirements.

Combine that characteristic with exceptionally heavy .458-caliber projectiles, a fast 1:10 twist barrel and extended cartridge overall-length capability, and the CM7S provides a specialized platform for heavy subsonic .458 SOCOM.

The result is a 458 Caliber Bolt Action Rifle engineered around the characteristics that make heavy subsonic cartridges distinctive.

For a deeper technical explanation, see the Chattahoochee Munitions 458 SOCOM Subsonic guide.

650gr Maker REX Bolt-Action Ammunition

Chattahoochee Munitions offers 458 SOCOM Subsonic Ammo developed specifically for the bolt-action side of the Terminal 458 ecosystem.

The load uses a 650gr Maker REX solid-copper expanding projectile loaded in factory-new Starline .458 SOCOM brass at an overall cartridge length of 2.802 inches. The load is intended for the CM7S bolt-action platform and other appropriately configured bolt-action firearms; it is not the ammunition configuration developed for the CM10 semi-automatic platform.

For shooters focused on heavy-projectile and subsonic applications, the 458 Caliber Bolt Action Rifle combines the CM7S short-action architecture with the fast-twist barrel and extended-OAL capability of the SOCOM XL configuration.

Key Features

• Chattahoochee Munitions CM7S bolt-action platform
• Chambered in .458 SOCOM
• SOCOM XL extended cartridge overall-length capability
• 16-inch Mos-Tek 416R stainless barrel
• 5R rifling
• Fast 1:10 twist rate
• 11/16×24 muzzle threads
• TriggerTech Primary Remington 700 trigger
• Flat or curved trigger shoe option
• Trigger set at approximately 1.5 lb
• Short-action architecture
• Designed around exceptionally heavy .458-caliber projectiles
• Genuine MDT metal AICS-pattern magazine modified by Chattahoochee Munitions
• Extended cartridge overall-length capability
• Well suited to suppressed and subsonic applications
• Manufactured and assembled by Chattahoochee Munitions

Specifications

• Chambering: .458 SOCOM
• SOCOM XL Capability: Extended-OAL Configuration
• Platform: CM7S Bolt Action
• Barrel Manufacturer: Mos-Tek
• Barrel Length: 16″
• Barrel Material: 416R Stainless Steel
• Rifling: 5R
• Twist Rate: 1:10
• Muzzle Threads: 11/16×24
• Trigger: TriggerTech Primary Remington 700
• Trigger Shoe: Flat or Curved
• Trigger Pull: Set at approximately 1.5 lb
• Magazine: Modified MDT Metal AICS-Pattern Magazine
• Weight: 6 lb 6 oz
• Overall Length: 23.875″ – 31.00″
• Length of Pull: 6.0″ – 13.5″

Who Is the CM7S For?

The CM7S isn’t intended to be another conventional bolt-action rifle. It is designed for shooters specifically interested in the capabilities of large-diameter, exceptionally heavy projectiles and suppressed shooting.

If you’re looking for a 458 Caliber Bolt Action Rifle that moves beyond the dimensional restrictions imposed by an AR-15 magazine, the CM7S provides a platform configured specifically around that objective.

From the fast-twist Mos-Tek barrel and TriggerTech Primary trigger to the modified MDT magazine system, the rifle is built around extended-length .458 SOCOM capability rather than treating SOCOM XL as an afterthought.

FAQ

What is a 458 Caliber Bolt Action Rifle?

A 458 Caliber Bolt Action Rifle is a bolt-operated rifle built around a .458-caliber cartridge. The CM7S is chambered in .458 SOCOM and configured to take advantage of the extended cartridge overall length associated with the SOCOM XL system.

Is the CM7S chambered in .458 SOCOM XL?

No separate .458 SOCOM XL chamber is used. The chambering is .458 SOCOM. SOCOM XL refers to the extended cartridge overall-length capability provided by compatible Chattahoochee Munitions firearm and magazine configurations.

What is .458 SOCOM XL?

.458 SOCOM XL uses additional cartridge overall length available outside the traditional AR-15 magazine envelope. This gives long, heavy .458-caliber projectiles additional seating flexibility while retaining the .458 SOCOM chamber and cartridge case.

Is .458 SOCOM XL the same chambering as .458 SOCOM?

Yes. The chamber remains .458 SOCOM. SOCOM XL describes how compatible firearms, magazines and ammunition use additional cartridge overall length; it does not describe a different chamber.

What is the barrel length?

The CM7S uses a 16-inch Mos-Tek barrel.

What is the barrel twist rate?

The barrel uses a 1:10 twist rate selected to support the long, exceptionally heavy projectiles used in the SOCOM XL application.

What trigger does the CM7S use?

The rifle comes standard with a TriggerTech Primary Remington 700 trigger set at approximately 1.5 pounds. Customers can select either a flat or curved trigger shoe.

What magazine does the CM7S use?

The complete CM7S SOCOM XL firearm uses a genuine MDT metal AICS-pattern magazine modified by Chattahoochee Munitions specifically for the extended-length .458 SOCOM application.

Is the CM7S designed for suppressed shooting?

Yes. The combination of the CM7S bolt-action platform, exceptionally heavy .458-caliber projectile capability, fast 1:10 twist barrel and extended-OAL SOCOM XL configuration makes this 458 Caliber Bolt Action Rifle particularly well suited to suppressed and subsonic applications.

Where can I find other .458 SOCOM firearms, ammunition and components?

Visit Terminal 458 for Chattahoochee Munitions CM7S and CM10 firearms, bolt-action and semi-automatic ammunition, the SOCOM XL magazine and supporting technical information.