AR-15Bolt face: 5.56/.223
.458 SOCOM Ballistics
Proprietary big-bore cartridge developed by Marty ter Weeme. Uses a rebated rim to fit the standard AR-15 bolt face. Subsonic and supersonic loads available. Popular for hunting and suppressed use.
Cartridge Specifications
SAAMI Max Pressure
Bullet Diameter
Case Length
Overall Length
Parent Case
Bolt Face
Min Barrel
Platform
Common Bullet Weights and Types
SBR 300 gr Barnes TTSX500 gr subsonic
Effective Range by Application
Hunting large game0 to 200 yd
Self-defense0 to 150 yd
Suppressed subsonic0 to 100 yd
Barrel Twist Rate Recommendations
250 to 300 gr1:14
300 to 600 gr1:14 or 1:18
Data Disclaimer
Ballistic data is approximate and varies by ammunition lot, barrel condition, altitude, and temperature. Data sourced from published SAAMI and manufacturer load data. Always confirm zero and trajectory with your specific firearm.
Detailed load data for .458 SOCOM is coming soon. In the meantime, review the specifications above and consult your ammunition manufacturer for load-specific trajectory.
Pick the right barrel
Twist rate should match the bullet weights you plan to shoot. See barrel steel grades, profiles, chamber types, and twist rate guidance on the barrel specs page, then jump into the builder to filter barrels chambered in .458 SOCOM.