
Availability: In Stock
Underwood Ammo 231 10mm 135gr jacketed hollow point ammunition delivers serious stopping power in a compact, versatile round. This is hot-loaded 10mm ammo built for shooters who want real-world performance from their defensive or hunting loads. Each box contains 20 rounds loaded in nickel-plated brass cases—new production, boxer-primed, and reloadable for shooters who like to get the most from their brass.
The 135-grain copper-lead hollow point is designed to expand reliably while delivering the velocity and energy needed for effective terminal performance. At 1600 fps muzzle velocity and 768 ft-lbs of muzzle energy, these rounds are supersonic and built for the power and penetration 10mm is known for. Whether you're running them in a tactical pistol, competition setup, or field gun, the jacketed hollow point gives you controlled expansion and predictable performance on target.
Built for shooters who demand serious ammo, Underwood 231 10mm rounds are non-corrosive and suppressor-safe, so you can push them through any 10mm platform without hesitation. The nickel-plated cases are easy to spot on the range and built to last through multiple reloads if you're into handloading. This is the kind of ammunition that rewards a quality 10mm pistol with real-world stopping capability.
| Caliber | 10mm Auto |
| Bullet Weight | 135 grains |
| Bullet Type | Jacketed Hollow Point |
| Bullet Diameter | 0.4" |
| Muzzle Velocity | 1600 fps |
| Muzzle Energy | 768 ft-lbs |
| Case Material | Nickel Plated Brass |
| Case Type | Boxer-Primed, Reloadable |
| Corrosive | Non-Corrosive |
| Ballistic Coefficient (G1) | 0.093 |
| Sectional Density | 0.121 |
| Rounds Per Box | 20 |
| Boxes Per Case | 10 |
| Manufacturer | Underwood Ammo |
Yes. These rounds are suppressor-safe and designed for use with sound suppressors.
Yes. This ammo uses boxer-primed, reloadable nickel-plated brass cases, making it ideal for reloaders who want to handload their own 10mm rounds.
Each case contains 10 boxes, with 20 rounds per box, for a total of 200 rounds per case.
This ammunition is designed for self-defense and hunting applications. The 135-grain jacketed hollow point is built for reliable expansion and terminal performance in both roles.

SKU: 152744392 • Width: 2.6in • Height: 1.4in • Depth: 3.2in • Weight: 0.7oz





Availability: In Stock
Underwood Ammo 231 10mm 135gr jacketed hollow point ammunition delivers serious stopping power in a compact, versatile round. This is hot-loaded 10mm ammo built for shooters who want real-world performance from their defensive or hunting loads. Each box contains 20 rounds loaded in nickel-plated brass cases—new production, boxer-primed, and reloadable for shooters who like to get the most from their brass.
The 135-grain copper-lead hollow point is designed to expand reliably while delivering the velocity and energy needed for effective terminal performance. At 1600 fps muzzle velocity and 768 ft-lbs of muzzle energy, these rounds are supersonic and built for the power and penetration 10mm is known for. Whether you're running them in a tactical pistol, competition setup, or field gun, the jacketed hollow point gives you controlled expansion and predictable performance on target.
Built for shooters who demand serious ammo, Underwood 231 10mm rounds are non-corrosive and suppressor-safe, so you can push them through any 10mm platform without hesitation. The nickel-plated cases are easy to spot on the range and built to last through multiple reloads if you're into handloading. This is the kind of ammunition that rewards a quality 10mm pistol with real-world stopping capability.
| Caliber | 10mm Auto |
| Bullet Weight | 135 grains |
| Bullet Type | Jacketed Hollow Point |
| Bullet Diameter | 0.4" |
| Muzzle Velocity | 1600 fps |
| Muzzle Energy | 768 ft-lbs |
| Case Material | Nickel Plated Brass |
| Case Type | Boxer-Primed, Reloadable |
| Corrosive | Non-Corrosive |
| Ballistic Coefficient (G1) | 0.093 |
| Sectional Density | 0.121 |
| Rounds Per Box | 20 |
| Boxes Per Case | 10 |
| Manufacturer | Underwood Ammo |
Yes. These rounds are suppressor-safe and designed for use with sound suppressors.
Yes. This ammo uses boxer-primed, reloadable nickel-plated brass cases, making it ideal for reloaders who want to handload their own 10mm rounds.
Each case contains 10 boxes, with 20 rounds per box, for a total of 200 rounds per case.
This ammunition is designed for self-defense and hunting applications. The 135-grain jacketed hollow point is built for reliable expansion and terminal performance in both roles.
SKU: 152744392 • Width: 2.6in • Height: 1.4in • Depth: 3.2in • Weight: 0.7oz
