Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For self defense shooters running 45 ACP pistols, the Underwood 174-grain Lehigh Maximum Expansion brings hydraulic-driven terminal performance in a lead-free solid copper projectile. This 45 ACP self defense ammo expands on contact with fluid-based tissue while resisting premature expansion when punching through drywall, wood, bone, or sheet metal — a critical distinction when intermediate barriers stand between muzzle and threat. At 1050 feet per second and 426 foot-pounds from a Government-length barrel, the 174-grain Lehigh Maximum Expansion delivers energy comparable to traditional 230-grain loadings with less felt recoil and no lead exposure during indoor training.
Performance at a Glance
Underwood machines each projectile from solid copper bar stock using Lehigh’s Maximum Expansion geometry — a deep cavity that funnels hydraulic pressure outward into six pre-stressed petals. On tissue contact, those petals deploy to maximum diameter and hold position throughout penetration, maintaining cutting surface where expansion matters. The nickel-plated brass resists tarnish in humid carry environments and feeds reliably in 1911, Glock 21, SIG P220, and Springfield XD platforms. Boxer primers and reloadable cases extend the service life of each hull for handloaders who track brass.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 45 ACP |
| Bullet weight | 174 grains |
| Bullet type | Solid Hollow Point (Lehigh Maximum Expansion) |
| Muzzle velocity | 1050 fps |
| Muzzle energy | 426 ft·lbs |
| Rounds/box | 20 |
| Case | Nickel plated brass |
| Primer | Boxer |
| Corrosive | No |
| Lead free | Yes |
| Reloadable | Yes |
| Intended use | Self Defense |
| Manufacturer | Underwood |
Lehigh’s expansion geometry distinguishes this load from traditional jacketed hollow points that mushroom and collapse diameter after initial contact. The solid copper construction eliminates lead dust at the firing line — a key advantage for frequent practice with carry-weight ammunition. Browse the full 45 ACP ammo catalog for training ball and barrier-blind bonded 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 universal firearm safety rules at all times — treat every firearm as loaded, never point at anything you are not willing to destroy, keep your finger off the trigger until ready to fire, and be certain of your target and what lies beyond it.
- Verify current state and local ammunition regulations before purchase — some jurisdictions restrict hollow point or lead-free projectiles for civilian possession.
- This product contains materials known to the State of California to cause cancer and birth defects or other reproductive harm under Proposition 65. Lead-free copper projectiles eliminate exposure during shooting but nickel plating may contain trace regulated substances.
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