Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For self-defense shooters running 45 ACP Xtreme Defender ammo, the Underwood Xtreme Defender 45 ACP 135 Grain Lehigh Xtreme Defense Fluted Lead Free brings barrier-blind terminal performance and reduced recoil in a lead-free copper package. Built around Lehigh’s fluted-nose design, this round generates a permanent wound cavity over twice the diameter of conventional expanding hollowpoints while maintaining 18 inches of penetration through wallboard, automotive glass, and sheet metal without loss of terminal effect. At 1240 fps and 461 ft-lbs from a 5-inch barrel, the Underwood Xtreme Defender 45 ACP load remains subsonic-adjacent yet supersonic — fast enough for hydraulic disruption, mild enough for rapid follow-ups.
Performance at a Glance
Underwood Ammo builds this load with Lehigh Xtreme Defense projectiles — solid copper bullets machined with radial flutes that channel hydraulic pressure inward rather than relying on expansion. The flutes create cutting edges and force energy laterally into tissue, producing a wound channel FBI testing confirms at 18 inches. Nickel-plated brass cases resist tarnish during carry and improve feeding across platforms from single-stack 1911s to double-stack polymer frames. Flash-suppressed powder maintains night vision during low-light encounters, and boxer primers allow reloading for shooters managing training costs. Each 135-grain bullet leaves the muzzle at 1240 fps with 461 ft-lbs of energy, delivering more velocity than traditional 230-grain ball while cutting felt recoil by roughly 30 percent.
| Spec | Value |
|---|---|
| Caliber | 45 ACP |
| Bullet weight | 135 grains |
| Bullet type | Lehigh Xtreme Defense (fluted solid copper) |
| Muzzle velocity | 1240 fps |
| Muzzle energy | 461 ft-lbs |
| Rounds per box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer |
| Corrosive | No |
| Lead-free | Yes |
| Reloadable | Yes |
| Intended use | Self-defense |
| Manufacturer | Underwood Ammo |
This round fits concealed-carry rotation where barrier encounters remain possible — apartment walls, vehicle glass, heavy clothing — and where reduced recoil speeds follow-up strings. The fluted nose defeats intermediate barriers without deformation, maintaining terminal geometry from muzzle to target. Shooters in lead-restricted ranges or jurisdictions requiring non-toxic ammunition will find the solid copper construction compliant without sacrificing wound-channel diameter. Compare terminal performance and recoil impulse across our 45 ACP ammo catalog to match velocity, bullet weight, and barrier performance to your carry platform and threat model.
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.
- Observe the four rules of firearm safety during loading and unloading.
- Verify current state and local laws governing handgun ammunition purchase and possession in your jurisdiction.
- Though lead-free, solid copper bullets may produce barrel fouling — clean bore after extended strings to maintain accuracy.
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