Chattahoochee Munitions manufactures this 458 SOCOM subsonic ammo for its CM7S bolt action: a 650 gr Maker REX solid copper expanding bullet in factory-new Starline 458 SOCOM brass, loaded as 458 SOCOM XL to 2.802 inches. From a 12.5-inch CM7S barrel it averages about 1,010 fps and about 1,473 ft-lb at the muzzle. Twenty rounds per box.
Standard 458 SOCOM is limited to 2.260 inches overall by the AR15 magazine. 458 SOCOM XL moves past that limit: the 2.035-inch, 650 gr subsonic projectile is seated less deeply, reclaiming usable case capacity for powder. See every configuration on Terminal 458.
For Bolt Action Firearms Configured for XL
This 458 SOCOM subsonic ammo is loaded for the CM7S and other bolt actions configured for 458 SOCOM XL. It will not run in an AR15 or a mini action, and it is not intended for the CM10, which uses its own 2.790-inch 458 SOCOM semi auto ammo. Use it in a barrel with a 1:10 twist or faster and with the 458 SOCOM XL magazine.
Why 650 gr Subsonic
Below the speed of sound, energy comes from bullet weight, so the 650 gr bullet carries about 30 percent more energy than a 500 gr bullet at the same speed. At about 1,010 fps the load stays below the speed of sound even at 0°F. With an enclosed suppressor and a bolt action that adds no action noise, the shot is quiet. Read 458 SOCOM subsonic.
Maker REX Projectile
The 650 gr REX is CNC-machined from solid copper and is lead free. It is 2.035 inches long, with a sectional density of .443 and a ballistic coefficient of .44 G1. Maker designs REX projectiles to expand at subsonic velocity; Maker states they expand to nearly three times their original diameter while keeping nearly all of their weight. Read 458 SOCOM hunting and 458 SOCOM for bear.
458 SOCOM Subsonic Ammo Ballistics
| Range | Velocity | Energy | Drop (100-yard zero) | Time of flight |
|---|---|---|---|---|
| Muzzle | 1,010 fps | 1,473 ft-lb | – | 0.00 s |
| 100 yd | 964 fps | 1,342 ft-lb | 0.0 in | 0.30 s |
| 200 yd | 925 fps | 1,235 ft-lb | -35.9 in | 0.62 s |
| 300 yd | 891 fps | 1,146 ft-lb | -112.2 in | 0.95 s |
Velocity is a 10-shot Chattahoochee Munitions average from a 12.5-inch CM7S barrel; the rest is calculated with a .44 G1 ballistic coefficient. Full tables are in 458 SOCOM ballistics, and 458 SOCOM effective range covers holds and ranging.
458 SOCOM Subsonic Ammo Specifications
- Manufacturer: Chattahoochee Munitions
- Cartridge: 458 SOCOM, loaded as 458 SOCOM XL
- Bullet: 650 gr Maker REX, solid copper, expanding, lead free
- Bullet diameter: .458 inch
- Projectile length: 2.035 inches
- Sectional density: .443
- Ballistic coefficient: .44 G1
- Brass: Factory-new Starline 458 SOCOM
- Cartridge overall length: 2.802 inches
- Velocity: About 1,010 fps, 10-shot average, 12.5-inch CM7S barrel
- Muzzle energy: About 1,473 ft-lb
- Twist required: 1:10 or faster
- Platform: Bolt actions configured for 458 SOCOM XL, such as the CM7S
- Magazine: 458 SOCOM XL magazine, modified MDT metal AICS pattern
- Quantity: 20 rounds
458 SOCOM Subsonic Ammo FAQ
Who makes 650 gr 458 SOCOM subsonic ammo?
Chattahoochee Munitions manufactures 650 gr Maker REX 458 SOCOM subsonic ammo, loaded as 458 SOCOM XL to 2.802 inches for the CM7S bolt action.
Will it run in an AR15?
No. An AR15 accepts cartridges up to 2.260 inches. This load is 2.802 inches and needs a bolt action configured for 458 SOCOM XL.
Can I shoot it in the CM10?
No. The CM10 uses the 2.790-inch semi-auto load, which has a propellant configuration that cycles the rifle.
Does 458 SOCOM XL use a different chamber?
No. The chamber and case are standard 458 SOCOM. XL names the projectile and the loaded ammunition.
How fast is it?
About 1,010 fps from a 12.5-inch CM7S barrel, with about 1,473 ft-lb at the muzzle and 1,342 ft-lb at 100 yards.
What twist rate does it need?
1:10 or faster. Every Chattahoochee Munitions 458 SOCOM barrel is 1:10.
Is it lead free?
Yes. The 650 gr Maker REX is solid copper.
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