Underwood Ammo 678Underwood Ammo 678 Xtreme Defense Platinum 380ACP 68gr Solid Monolithic 20 Per Box/10 Case
$26.98
Underwood Ammo 678 Xtreme Defense Platinum is a 380 ACP self-defense round built on a solid monolithic copper bullet designed to deliver reliable performance when it matters most. This 68-grain load launches at 1300 feet per second with 255 foot-pounds of muzzle energy, offering the speed and energy needed for effective defensive scenarios in a compact, manageable platform. Whether you carry a compact 380 for backup or primary defense, this ammunition pairs stopping power with the predictability of a proven design.
The round features a solid monolithic copper bullet—no lead—that's engineered for controlled expansion and consistent performance. Underwood's engineering focuses on penetration and terminal performance in real-world self-defense contexts, making this a serious choice for shooters who demand more from their defensive ammunition than off-the-shelf commodity rounds. The nickel-plated brass casing resists corrosion and adds visual distinction to your reloads, while the boxer primer and reloadable brass keep your costs manageable over time.
If you run a suppressor on your 380, this round is rated safe for suppressed fire, giving you flexibility in how you train and carry. The ballistic coefficient and sectional density figures reflect a bullet optimized for the .380's inherent velocity and energy envelope—realistic performance expectations for the cartridge, not marketing hype. Each box contains 20 rounds, sold in cases of 10 boxes.
Key Features
- Solid monolithic copper bullet—no lead
- 1300 feet per second muzzle velocity
- 255 foot-pounds muzzle energy
- Designed for self-defense applications
- Safe for use in suppressed firearms
- Nickel-plated brass cases for corrosion resistance
- Boxer-primed, reloadable brass
- Non-corrosive, new production
Specifications
| Caliber | .380 ACP |
| Bullet Weight | 68 grains |
| Bullet Diameter | 0.355" |
| Bullet Type | Solid Monolithic Copper |
| Muzzle Velocity | 1300 fps |
| Muzzle Energy | 255 ft-lbs |
| Ballistic Coefficient (G1) | 0.087 |
| Sectional Density | 0.077 |
| Case Material | Nickel-Plated Brass |
| Primer Type | Boxer |
| Rounds Per Box | 20 |
| Boxes Per Case | 10 |
| Lead-Free | Yes |
| Suppressor Safe | Yes |
| Reloadable | Yes |
Frequently Asked Questions
Is Underwood 678 Xtreme Defense Platinum safe to shoot in a suppressor?
Yes, this ammunition is rated safe for suppressed fire. If you run a suppressor on your .380, you can confidently load this round for training or defensive carry.
Can I reload the brass cases?
Yes. The ammunition comes in nickel-plated boxer-primed brass cases, which are fully reloadable. Once fired, you can recycle the cases using standard .380 ACP reloading dies and data.
Is this ammunition lead-free?
Yes. The bullet is made from solid monolithic copper with no lead content, making it a good choice for ranges or shooting environments where lead ammunition is restricted.
What makes this round designed for self-defense?
The solid monolithic copper bullet is engineered for terminal performance in defensive scenarios, and the 1300 fps velocity with 255 foot-pounds of energy is optimized for the .380 ACP platform. It's a purpose-built defensive load, not a generic practice round.
