Guides to Subsonic Rifle Cartridges
Each guide below covers one of the subsonic rifle cartridges CM manufactures firearms for.- 375 Raptor: 375 Raptor suppressor guide. Firearms: The Raptor Paddock.
- 458 SOCOM XL: 458 SOCOM subsonic, including extra-long XL projectiles for CM7S bolt actions and center-feed CM10 configurations. Firearms: Terminal 458.
- 8.6 Blackout: 8.6 Blackout subsonic, with 1:3 vs 1:5 twist and barrel length. Firearms: Area 8.6.
- 300 Blackout: 300 Blackout subsonic and the 300 Blackout gas system guide. Firearms: Sector 300.
- 308 Winchester: 308 subsonic vs supersonic, with bullet weight, 1:5 and 1:8 twist and enclosed suppressors. Firearms: District 308.
- 338 ARC: 338 ARC subsonic. Firearms: Containment Zone 338.
Other Cartridge Guides
- 22 ARC: 22 ARC rifle guide, covering AR-15 and bolt-action options. Firearms: Flight Deck 22.
308 Subsonic vs Supersonic: Twist Rate, Suppressors and Platform Choice
The short answer to 308 subsonic vs supersonic is that the two loads potentially ask for different firearms. A supersonic 308 Winchester load drives a 150 to 180-grain bullet well […]
300 Blackout Gas System: Proven AR-15 Tuning Guide
How pistol and micro-length gas, an adjustable gas block, buffer tuning and suppressor back pressure keep a 300 Blackout AR-15 cycling reliably.
300 Blackout Subsonic: Suppression, Cycling and Platform Guide
Why subsonic is 300 Blackout’s real strength: 10 to 10.5-inch barrels with a 1:5 twist, suppressor behavior, AR-15 cycling and bolt-action advantages.
8.6 Blackout Subsonic: Barrel Length, Twist Rate and Suppressor Guide
How barrel length, 1:3 vs 1:5 twist, projectile weight and suppressor choice affect 8.6 Blackout subsonic performance, based on CM testing.
22 ARC Rifle Guide: Powerful AR-15 & Bolt Action Options
What the 22 ARC offers on two platforms, the semi-automatic AR-15 and the CM7S bolt action, and how to choose between them.
338 ARC Subsonic: Understanding the .338-Caliber AR-15 Cartridge
How the 338 ARC brings heavy .338-caliber subsonic and supersonic capability to the AR-15 platform, and how CM configures firearms around it.
458 SOCOM Subsonic: Unlocking Powerful Performance Beyond the AR-15
Why heavy 458 SOCOM subsonic projectiles outgrow the AR-15, what 458 SOCOM XL changes, and how the CM7S and center-feed CM10 run XL loads.
375 Raptor Suppressor Guide: Choosing the Right Suppressor for 375 Raptor
How to choose a 375 Raptor suppressor: size, weight, mounting, subsonic vs supersonic suppression, and where the PLACID .375 fits a complete hunting rifle.
About CM Guides to Subsonic Rifle Cartridges
Chattahoochee Munitions manufactures CM7S bolt-action firearms and CM10 and CM15 semi-automatic firearms in the subsonic rifle cartridges these guides cover. Each guide is written from the configurations CM produces and the testing behind them. Where a figure comes from CM testing, the guide says so; where it is general industry information, it is labeled as such. Cartridge dimensions and pressure standards reference SAAMI, and projectile data comes from the bullet manufacturer, such as Maker Bullets for CM’s subsonic loads.
New guides are added as CM develops firearms and loads for additional subsonic rifle cartridges. Many firearms chambered in subsonic rifle cartridges are short-barreled rifles or are used with suppressors; see NFA firearms for how CM handles NFA transfers, and follow all applicable federal, state and local requirements.