Underwood Ammo 10mm 135gr JHP - 20 Round Box Premium Defense

The Underwood Ammo 231 delivers exceptional stopping power with its 135-grain jacketed hollow point design, engineered for maximum expansion and energy transfer in 10mm applications. This premium defensive ammunition combines consistent accuracy with reliable terminal performance across various barrel lengths.

What Makes This Different

Underwood's proprietary powder blend generates higher velocities than standard 10mm loads, pushing the 135-grain JHP to approximately 1,400 fps from a 5-inch barrel. The nickel-plated brass cases resist corrosion and provide smooth feeding in semi-automatic pistols. Each cartridge undergoes strict quality control testing to ensure consistent chamber pressures and bullet seating depth.

Key Features

• 135-grain jacketed hollow point bullet optimized for controlled expansion
• Nickel-plated brass cases for enhanced corrosion resistance and extraction
• Flash-suppressed powder reduces muzzle signature in low-light conditions
• Compatible with all 10mm Auto firearms including Glock, 1911, and XD platforms
• Boxer-primed cases suitable for reloading applications
• Consistent velocities within 25 fps standard deviation
• 20-round packaging with individual foam inserts for protection

Field testing demonstrates reliable expansion at velocities between 900-1,400 fps, making this load effective across various barrel lengths from compact carry pistols to full-size duty weapons. The hollow point cavity design maintains structural integrity through intermediate barriers while providing rapid expansion in soft tissue. Law enforcement agencies have adopted this specification for its consistent performance in both urban and rural environments.

Technical Specs

• Caliber: 10mm Auto
• Bullet Weight: 135 grains
• Bullet Type: Jacketed Hollow Point (JHP)
• Muzzle Velocity: ~1,400 fps (5-inch barrel)
• Muzzle Energy: ~587 ft-lbs
• Case Material: Nickel-plated brass
• Primer: Boxer, non-corrosive
• Quantity: 20 rounds per box
• Manufacturer: Underwood Ammo, USA

This ammunition represents the optimal balance between manageable recoil and terminal effectiveness for 10mm platforms. The 135-grain weight provides faster follow-up shots compared to heavier bullets while maintaining sufficient mass for deep penetration. Professional shooters choose this specification when maximum reliability and consistent performance are non-negotiable.