Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For concealed carriers running pocket pistols chambered in 32 ACP, terminal performance matters as much as reliability — and the Underwood 55-grain Lehigh Xtreme Defense delivers both. This lead-free self-defense round uses a CNC-machined solid copper projectile with radial flutes that channel hydraulic energy inward, building pressure and carving a permanent wound cavity documented at 18 inches in calibrated gelatin — twice the diameter of conventional expanding bullets. At 950 feet per second, you’re getting controlled penetration without the barrier defeats or fragmentation common to lightweight hollow points in this chambering.
Performance at a Glance
Underwood Ammo machines each Xtreme Defense projectile from solid copper stock, eliminating lead exposure during reloading or indoor range sessions. The fluted nose geometry maintains full performance through wallboard, sheet metal, and automotive glass — barriers that often plug expanding bullets and reduce effectiveness. Nickel-plated brass cases resist corrosion in holster leather, feed cleanly in older European pistols with tight chambers, and segregate easily from brass during reloading prep. Flash-suppressed powder keeps your night sights visible in low-light encounters. Boxer primers allow standard reloading procedures if you choose to resize and reload these premium cases.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 32 ACP |
| Bullet weight | 55 grains |
| Bullet type | Lehigh Xtreme Defense fluted copper |
| Muzzle velocity | 950 fps |
| Muzzle energy | 110 ft-lbs |
| Lead-free | Yes |
| Rounds per box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Intended use | Self-defense |
| Manufacturer | Underwood Ammo |
The 55-grain bullet weight balances velocity and energy in short-barreled platforms — Kel-Tec P-32, Beretta 3032 Tomcat, Walther PP, NAA Guardian — where heavier bullets often lose too much velocity to expand reliably. Underwood subjects every lot to live-fire testing in real-world firearms, not just universal receivers. Browse the full 32 ACP ammo selection for FMJ practice loads and additional defensive options.
Safe Handling & Compliance
Federal law requires purchasers to be at least 21 years old 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.
- Observe the four rules of firearms safety at all times — treat every firearm as loaded, keep your finger off the trigger until sights are on target and you’ve made the decision to fire, never point at anything you’re not willing to destroy, and be certain of your target and what lies beyond it.
- Verify that your state and local jurisdiction permit possession and use of this ammunition; some municipalities restrict hollow-point or lead-free projectiles.
- This product contains chemicals known to the State of California to cause cancer and reproductive harm (Prop 65). Store in original packaging, handle with care, and wash hands after range sessions.
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