Underwood Ammo 836Underwood Ammo 836 Xtreme Penetrator 357Mag 140gr Solid Monolithic 20 Per Box/10 CaseUnderwood Ammo$42.97
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Underwood Ammo
The Underwood Ammo 10mm 140gr Xtreme Penetrator is a solid copper, lead-free handgun round built for serious shooters who need reliable performance in self-defense and hunting scenarios. Loaded to 1500 feet per second with 700 ft-lbs of muzzle energy, this cartridge delivers the speed and stopping power 10mm shooters expect, while the copper construction ensures deep penetration and consistent expansion on target. Whether you're running a 10mm pistol for personal protection or hunting applications, this round offers the ballistic certainty of a proven, purpose-built load.
The nickel-plated brass cases are easy to reload and resist corrosion—a practical detail if you're a hand-loader or just want ammo that performs reliably in varied conditions. At 0.125 sectional density, the 140gr Xtreme Penetrator is engineered to cut through barriers and maintain velocity, making it an excellent choice for defensive scenarios where penetration matters. The round travels supersonic throughout its flight path, a characteristic that appeals to shooters who understand the ballistic advantages of velocity and sound.
Underwood's reputation for high-quality, hard-hitting ammunition is well-earned, and this load is no exception. Each box contains 20 rounds of factory-loaded ammunition ready to shoot. The suppressor-safe designation means you can run this round through a can without worry—a practical benefit for shooters with noise concerns at the range or in the field.
| Caliber | 10mm Auto |
| Bullet Weight | 140 grains |
| Bullet Material | Copper (lead-free) |
| Bullet Diameter | .400" |
| Muzzle Velocity | 1500 fps |
| Muzzle Energy | 700 ft-lbs |
| Sectional Density | 0.125 |
| Case Material | Nickel-plated brass |
| Rounds Per Box | 20 |
| Manufacturer | Underwood Ammo |
Yes. The Xtreme Penetrator round is rated safe for use with suppressors, making it a solid choice if you run a suppressed 10mm platform.
Both. Underwood engineered this load as a proven round for hunting applications and as an effective choice for self-defense scenarios. The copper bullet and high sectional density support deep, reliable penetration in either use case.
Yes. The nickel-plated brass cases are reloadable, so you can recycle them if you hand-load ammunition.
Each box contains 20 loaded rounds, ready to shoot.
Underwood Ammo
The Underwood Ammo 10mm 140gr Xtreme Penetrator is a solid copper, lead-free handgun round built for serious shooters who need reliable performance in self-defense and hunting scenarios. Loaded to 1500 feet per second with 700 ft-lbs of muzzle energy, this cartridge delivers the speed and stopping power 10mm shooters expect, while the copper construction ensures deep penetration and consistent expansion on target. Whether you're running a 10mm pistol for personal protection or hunting applications, this round offers the ballistic certainty of a proven, purpose-built load.
The nickel-plated brass cases are easy to reload and resist corrosion—a practical detail if you're a hand-loader or just want ammo that performs reliably in varied conditions. At 0.125 sectional density, the 140gr Xtreme Penetrator is engineered to cut through barriers and maintain velocity, making it an excellent choice for defensive scenarios where penetration matters. The round travels supersonic throughout its flight path, a characteristic that appeals to shooters who understand the ballistic advantages of velocity and sound.
Underwood's reputation for high-quality, hard-hitting ammunition is well-earned, and this load is no exception. Each box contains 20 rounds of factory-loaded ammunition ready to shoot. The suppressor-safe designation means you can run this round through a can without worry—a practical benefit for shooters with noise concerns at the range or in the field.
| Caliber | 10mm Auto |
| Bullet Weight | 140 grains |
| Bullet Material | Copper (lead-free) |
| Bullet Diameter | .400" |
| Muzzle Velocity | 1500 fps |
| Muzzle Energy | 700 ft-lbs |
| Sectional Density | 0.125 |
| Case Material | Nickel-plated brass |
| Rounds Per Box | 20 |
| Manufacturer | Underwood Ammo |
Yes. The Xtreme Penetrator round is rated safe for use with suppressors, making it a solid choice if you run a suppressed 10mm platform.
Both. Underwood engineered this load as a proven round for hunting applications and as an effective choice for self-defense scenarios. The copper bullet and high sectional density support deep, reliable penetration in either use case.
Yes. The nickel-plated brass cases are reloadable, so you can recycle them if you hand-load ammunition.
Each box contains 20 loaded rounds, ready to shoot.
