Underwood Ammunition .380 ACP 90 Grain Lehigh Xtreme Penetrator (MPN: 641)
Concealed carry permit holders, backcountry outdoor enthusiasts, and personal defense strategists relying on subcompact .380 ACP handguns face a critical tactical dilemma: standard jacketed hollow points often fail to expand or under-penetrate through heavy denim, leather, or thick winter clothing barriers. Underwood Ammunition engineered their 90-grain Lehigh Xtreme Penetrator load (MPN: 641) specifically to overcome these micro-compact caliber limitations. Purpose-built to deliver barrier-blind straight-line penetration without relying on traditional hollow-point expansion, this high-performance defensive cartridge turns subcompact pistols into formidable protection tools.
At the center of Underwood’s 641 loading is the revolutionary Lehigh Defense solid copper Xtreme Penetrator projectile. CNC-machined from solid copper, the bullet features a distinctive fluted nose geometry with progressive radial hydraulics. Rather than expanding or mushrooming like traditional lead-core hollow points, these radial flutes scoop, compress, and accelerate fluid tissue outward upon impact. This hydraulic energy transfer creates a massive permanent wound cavity while the solid copper body punches straight through heavy clothing, bone, and tough barriers without deforming or veering off trajectory.
Out on the range or in high-stress personal protection scenarios, expect clean primary ignition, smooth feed-ramp transition, and flat flight paths. Propelling its 90-grain solid copper bullet at an impressive muzzle velocity of approximately 1,100 FPS out of short concealed-carry barrels, this load optimizes pressure curves to cycle semi-automatic handguns reliably. Underwood seats these non-lead projectiles in nickel-plated brass cases charged with low-flash propellants and non-corrosive boxer primers, ensuring superior corrosion resistance inside carry holsters, slick feeding across tight magazine lips, and preserved night vision during low-light encounters.
Armorer Bench Notes & Technical Maintenance Guidance
Shipping Restrictions: Ammunition sales are strictly regulated. Check all state and local laws prior to ordering. Fully compliant with lead-free ammunition mandates. Cannot ship to PO Boxes, APO/FPO addresses, or internationally. Must ship via ORM-D / Hazardous Ground transport.
Armorer Tip: Monolithic solid copper fluted projectiles feature a non-traditional nose profile that cuts through heavy barrier materials effortlessly. The smooth nickel-plated case coating enhances feeding lubricity in micro-compact pistols (like the Ruger LCP, Sig P238, or Glock 42). Periodically inspect magazine feed lips and clear holster lint to maintain 100% cycling reliability in everyday carry firearms.
Key Features
- Lehigh Solid Copper Fluted Bullet: CNC-machined monolithic copper construction delivers barrier-blind straight-line penetration.
- Progressive Radial Hydraulics: Fluted nose scoops and accelerates fluid outward to create wide permanent wound cavities without relying on expansion.
- 100% Lead-Free Construction: Retains 100% projectile weight through heavy clothing, denim, and tough obstacles.
- Slick Nickel-Plated Brass Casing: Resists sweat and holster corrosion while reducing feed-ramp friction for seamless slide cycling.
- Low-Flash Defense Powders: Specially formulated propellant charge suppresses muzzle flash to protect night vision during low-light engagements.
Product Specifications
- Brand: Underwood Ammunition
- Product Line: Personal Defense / Xtreme Penetrator Series
- MPN: 641
- UPC: 816874021948
- Caliber / Gauge: .380 ACP (.380 Auto / 9x17mm Browning)
- Bullet Weight: 90 Grain
- Bullet Type: Solid Monolithic Copper Xtreme Penetrator (Lehigh Defense / Lead-Free)
- Muzzle Velocity: ~1,100 FPS (Standard Test Barrel)
- Muzzle Energy: ~242 ft-lbs
- Casing Material: Nickel-Plated Brass (Reloadable)
- Primer Type: Boxer (Non-Corrosive)
- Box Quantity: 20 Rounds per Box
- Case Quantity: 500 Rounds (25 Boxes)
