.357 Magnum 140gr Xtreme Penetrator Solid Copper Ammo

Description

When barrier penetration and deep, predictable bullet performance matter, this .357 Magnum round delivers. Underwood Ammo pairs their reputation for hot loads with Lehigh Defense's Xtreme Penetrator bullet to create ammunition engineered for real-world scenarios. The solid copper construction is CNC-machined to near-perfect consistency, and it flies through barriers like heavy clothing, glass, and sheet metal without deformation while maintaining velocity and impact effectiveness.

What Makes the Xtreme Penetrator Design Work

The genius is in the nose geometry. Lehigh Defense's progressive flutes create something called fluid transfer action—basically, the bullet's design redirects hydraulic energy outward at impact, creating severe tissue damage without relying on traditional expansion or fragmentation. This means consistent performance whether the bullet hits bone, goes through a car door, or passes through intermediate barriers. You get over twice the penetration depth of most expanding ammunition, and the permanent wound cavity is larger than you'd expect from a solid copper bullet.

Built for Reliability

Nickel-plated brass cases feed smoother than standard brass and won't tarnish in storage or when exposed to moisture and leather. The new nickel plating process used here handles the hot pressures of magnum loads without cracking, so reloaders can safely use these casings for handloading. Flash-suppressed powder keeps your vision intact if you ever need to use this in low light. This is new production, non-corrosive, boxer-primed ammunition field-tested in real firearms people actually own—not just lab conditions.

Real-World Applications

The 140-grain weight is heavier than standard .357 loads, which means deeper penetration on medium to large game. It also works for situations where you need absolute certainty that your shot will reach vital areas and maintain effectiveness. The 1550 feet-per-second velocity from a standard barrel puts 747 foot-pounds of energy downrange. Lead-free copper construction makes it environmentally responsible while being extremely target-unfriendly.