The Underwood Ammo 648 Xtreme Penetrator 10mm Auto 140gr Solid Monolithic round is engineered for shooters who demand consistent performance from their handgun ammunition. Built around Lehigh Defense’s Xtreme Penetrator solid copper bullet, this load combines precise machining with a distinctive fluted nose profile to deliver straight, deep penetration and reliable feeding in modern semi-automatic pistols.

This 10mm Auto cartridge uses a 140-grain solid monolithic copper projectile seated in nickel-plated brass cases, producing a muzzle velocity of approximately 1500 feet per second and 700 foot-pounds of energy. The design is lead free and suppressor safe, making it suitable for hunting medium, large, and dangerous game as well as defensive use where controlled penetration and predictable terminal performance are important. Underwood Ammo’s focus on quality control and carefully selected components reflects the manufacturer’s reputation for precise, high-performance handgun ammunition.

Key Features:

• Manufacturer: Underwood Ammo
• Model: 648 Xtreme Penetrator
• Caliber: 10mm Auto
• Bullet Type: Solid Monolithic Copper
• Bullet Weight: 140 Grains
• Muzzle Velocity: 1500 Fps
• Muzzle Energy: 700 Ft Lbs
• Case Material: Nickel-Plated Brass
• Rounds Per Box: 20
• Lead Free: Yes
• Velocity Rating: Supersonic