Underwood Ammo High Performance .458 SOCOM FMJFN 350gr Ammo 20Rd Box UN461

The Underwood Ammo High Performance .458 SOCOM 350-grain Full Metal Jacket Flat Nose (FMJFN) load is engineered to unleash the absolute maximum terminal authority from your big-bore AR-15. The common failure point with lighter or expanding projectiles in dense brush is premature fragmentation or ricocheting when hitting heavy bone or thick obstacles. Underwood eliminates this bottleneck by pairing massive physical weight with a rugged, non-expanding flat-nose bullet, creating an unstoppable force that punches straight through barriers and heavy game without deflecting or breaking apart.

The technical advantage centers on crushing momentum and flawless magazine feeding. Pushing a heavy 350-grain solid copper-jacketed bullet allows the round to retain its immense physical energy much better than lighter, high-velocity rounds. The flat-nose nose profile serves a dual purpose: it creates massive frontal surface shock to prevent the bullet from tumbling or yawning mid-tissue, and it ensures smooth, hang-up-free feeding out of standard single-stack .458 SOCOM magazines.

Blasting out of the muzzle at 1,650 FPS to generate an impressive 2,116 ft-lbs of muzzle energy, this round delivers brutal short-range stopping power. Underwood utilizes an advanced, clean-burning powder blend infused with premium flash suppressors. Large-bore cartridges fired from short barrels are notorious for throwing a blinding sheet of fire, but this specialized formula tames that muzzle flash to preserve your night vision in low-light environments.

Every round is built using factory-new premium brass cases and ultra-responsive, non-corrosive Boxer primers to guarantee perfect mechanical timing and positive extraction. The predictable, uniform recoil impulse keeps you grounded and ready for fast follow-up shots. Whether you are tracking heavy hogs through thick bottomland brush, setting up a definitive camp-defense rifle in bear country, or running tactical barrier drills, this ultra-tough Underwood load delivers the deep tissue penetration and raw structural mass you can count on.

Key Benefits

• Non-Expanding Flat Nose Geometry: Delivers unmatched directional stability, forcing the bullet to track straight through bone and barriers without deflecting.
• Massive 350-Grain Momentum: Heavyweight projectile carries devastating short-range energy and kinetic crushing power through thick hide and muscle.
• Advanced Flash-Suppressed Powder: Clean-burning propellant significantly reduces blinding muzzle flash for superior shooter awareness in low light.
• Optimized Single-Stack Feeding: Flat-nose profile is perfectly calibrated for smooth, reliable feeding in modified AR-15 platforms.

Technical Specification

• Ballistics: .458 SOCOM | 1,650 FPS Muzzle Velocity | 2,116 ft-lbs Muzzle Energy | Heavy Big-Bore Profile
• Projectile: 350 Grain | Full Metal Jacket Flat Nose (FMJFN) | Deep-Penetration Solid Core
• Case/Primer: Premium Factory-New Brass | Non-Corrosive Boxer Primed | Flash-Suppressed Propellant
• Logistics: 20 Rounds Per Box | Underwood High Performance Series
• Dimensions: .458 SOCOM | ~1.45 lbs Per Box | SKU: UN461
• Application: Large Game Hunting, Feral Hogs, & Bear Defense | Tactical Barrier Penetration | Big-Bore AR-15 Platforms
• Standards: SAAMI Compliant | Match-Grade Handload Tolerances in a Factory Round

SMKW provides verified, factory-direct ammunition with strict quality control and fast fulfillment—source your .458 SOCOM loads from a retailer that understands performance requirements at a technical level.