Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For hunting applications where straight-line penetration matters more than expansion, the Underwood 44 Remington Magnum 220-grain Lehigh Xtreme Penetrator brings CNC-machined solid copper construction and a fluted nose profile that maintains trajectory through bone, hide, and connective tissue. At 1530 fps from a 7.5-inch test barrel, this load generates 1144 ft-lbs of muzzle energy — enough to anchor medium game at typical revolver distances. Underwood Ammunition machines each projectile from solid copper, eliminating lead and creating a monolithic design that won’t fragment or deflect on impact. The fluted nose channels fluid radially outward, creating hydraulic pressure spikes that widen the permanent wound channel beyond the projectile’s .429-inch diameter. Nickel-plated brass cases resist tarnish and feed smoothly in both revolvers and lever-action carbines.
Performance at a Glance
The Xtreme Penetrator design originated with Lehigh Defense as a barrier-blind projectile for law enforcement and hunting use. Unlike traditional hollow points that rely on expansion, the fluted nose maintains full-diameter contact with tissue while shedding energy through controlled fluid displacement. The blunt meplat initiates energy transfer on contact, and the flutes sustain it through the wound track. Underwood pairs this projectile with flash-suppressed powder formulated for consistent ignition across temperature ranges. Boxer-primed nickel-plated brass cases simplify brass recovery and support multiple reloading cycles. Each 20-round box ships DOT-regulated via ground transport — verify current ammunition shipping restrictions in your jurisdiction before ordering.
| Spec | Value |
|---|---|
| Caliber | 44 Remington Magnum |
| Bullet weight | 220 grains |
| Bullet type | Lehigh Xtreme Penetrator (fluted solid copper) |
| Muzzle velocity | 1530 fps (7.5-inch test barrel) |
| Muzzle energy | 1144 ft-lbs |
| Rounds/box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer |
| Corrosive | No |
| Lead-free | Yes |
| Reloadable | Yes |
| Intended use | Hunting |
| Manufacturer | Underwood Ammunition |
The solid copper construction eliminates lead exposure during handling and range cleanup, and the monolithic design ensures the projectile remains intact through intermediate barriers — glass, plywood, heavy fabric — without yaw or tumble. Underwood tests each lot in real-world firearms to confirm velocity and pressure specifications. For shooters running suppressed hunting revolvers or carbines, this load’s subsonic-capable powder burns cleanly and won’t damage baffles. Browse our full inventory of 44 Magnum ammo to compare terminal performance profiles and bullet weights for your hunting application.
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 the muzzle pointed in a safe direction at all times. Keep your finger off the trigger until ready to fire. Be certain of your target and what lies beyond it.
- Verify current state and local laws regarding ammunition purchase, possession, and transport — some jurisdictions restrict lead-free or solid copper projectiles.
- Store ammunition separately from firearms, in a locked container, away from moisture and temperature extremes.
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