Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For concealed carriers running subcompact 380 ACP +P platforms, Underwood’s 90-grain Lehigh Xtreme Penetrator offers a lead-free defensive solution built around controlled depth and barrier-blind performance. The 380 ACP +P is a higher-pressure variant of the standard 380 Auto cartridge, designed to extract additional velocity from short barrels while remaining safe in +P-rated firearms. This load pushes a solid copper projectile to 1200 feet per second, delivering 288 foot-pounds of muzzle energy — a meaningful step above standard-pressure 380 loads in the 90-100 ft-lb range.
Load Profile
The Lehigh Xtreme Penetrator distinguishes itself through geometry: a blunt nose initiates energy transfer on impact, while three radial flutes carved into the shank generate hydraulic pressure spikes as tissue fluids flow through the channels. This fluted design produces a permanent wound cavity wider than the projectile’s diameter without relying on expansion. Because the bullet is machined from solid copper bar stock — no lead core, no jacket separation — it maintains structural integrity through heavy clothing, auto glass, and wallboard. The projectile’s sectional density of 0.102 and ballistic coefficient (G1) of 0.12 reflect its short, lightweight profile, optimized for close-range terminal effect rather than long-range precision. Underwood chambers this round in nickel-plated brass cases, which resist tarnish during carry and extraction cycles, and uses flash-suppressed powder to preserve night vision in low-light defensive scenarios.
The Numbers
| Spec | Value |
|---|---|
| Caliber | .380 ACP +P |
| Bullet weight | 90 grains |
| Bullet type | Lehigh Xtreme Penetrator (solid copper, fluted) |
| Muzzle velocity | 1200 fps |
| Muzzle energy | 288 ft-lbs |
| Rounds/box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer (reloadable) |
| Corrosive | No |
| Lead content | Lead-free |
| Suppressor safe | Yes |
| Intended use | Self-defense |
| Manufacturer | Underwood Ammo |
This round fits any firearm chambered in 380 ACP that is rated for +P pressures — verify your pistol’s manual or contact the manufacturer before firing +P ammunition in standard-pressure-only guns. For more options in this caliber, browse our full 380 ammo selection.
Who It’s For
Underwood’s Xtreme Penetrator load serves daily carriers prioritizing penetration over expansion — particularly those who carry in environments where barriers (car doors, heavy winter clothing, plywood) may be present. The solid copper construction eliminates lead exposure during indoor range sessions and complies with lead-free ammunition mandates on public lands. Because the bullet does not fragment or shed material, it simplifies cleanup for reloaders who recover brass from indoor bays. The 20-round box count supports one or two complete magazine rotations in most micro-compact 380 platforms, allowing you to establish a defensive magazine and a range-verification magazine from a single purchase.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Treat every firearm as if it is loaded; keep your finger off the trigger until ready to fire; never point the muzzle at anything you are not willing to destroy; be certain of your target and what lies beyond it.
- Verify that your firearm is rated for +P pressures before chambering this ammunition — consult your owner’s manual or contact the manufacturer if unsure.
- Store ammunition in a climate-controlled environment (40–70°F) away from solvents, moisture, and direct sunlight to preserve primer sensitivity and powder stability.
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