Underwood Ammo 458 SOCOM 350gr FMJ - 20 Round Box

The Underwood Ammo 458 SOCOM 350-grain Full Metal Jacket delivers exceptional stopping power and penetration for large game hunting and tactical applications. This heavy-hitting cartridge transforms AR-15 platform rifles into formidable big-bore weapons capable of taking down the largest North American game.

What Makes This Different

Underwood's 458 SOCOM ammunition utilizes premium brass cases and carefully selected powder charges to achieve consistent velocities around 1,900 fps from 16-inch barrels. The 350-grain FMJ bullet construction provides deep penetration through heavy bone and dense tissue, outperforming standard 223/5.56 loads by delivering over 2,800 foot-pounds of muzzle energy. Each cartridge undergoes rigorous quality control testing to ensure reliable feeding and extraction in semi-automatic platforms.

Key Features

• 350-grain Full Metal Jacket bullet for maximum penetration and weight retention
• Optimized powder charge delivers consistent 1,900+ fps velocities
• Premium brass cases sized for reliable feeding in AR-15 platforms
• Compatible with standard AR-15 lower receivers and magazines
• 20 rounds per box packaging for range sessions and hunting trips
• Manufactured to SAAMI specifications for consistent performance
• Non-corrosive primers and powders for extended barrel life

Field testing demonstrates reliable cycling in properly configured 458 SOCOM rifles with appropriate buffer weights and gas system tuning. The heavy bullet weight maintains energy at extended ranges, making it effective for hunting elk, moose, and dangerous game at distances up to 200 yards. Law enforcement agencies appreciate the immediate stopping power for barrier penetration scenarios where standard rifle cartridges prove insufficient.

Technical Specs

• Caliber: 458 SOCOM
• Bullet Weight: 350 grains
• Bullet Type: Full Metal Jacket (FMJ)
• Muzzle Velocity: Approximately 1,900 fps (16" barrel)
• Muzzle Energy: 2,800+ foot-pounds
• Case Material: Premium brass
• Primer: Non-corrosive Boxer
• Quantity: 20 rounds per box
• Overall Length: 2.26 inches
• Manufactured: United States

This ammunition represents the pinnacle of big-bore AR-15 performance, combining Underwood's reputation for quality with the proven 458 SOCOM cartridge design. Serious hunters and tactical professionals rely on this load when maximum stopping power cannot be compromised.