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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.
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.
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.
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.
Instead of expanding like hollow points, the Xtreme Penetrator uses progressive nose geometry and fluid transfer technology to create a larger permanent wound cavity than most expanding bullets while maintaining straight penetration. It delivers consistent performance regardless of barriers like clothing or glass, which can sometimes shut down hollow points.
Yes, though Underwood advises against using this round in ultra-lightweight revolvers where extreme recoil might cause bullets to jump the crimp. Standard frame revolvers with shorter barrels will function fine, though velocity will be lower than from a 4-6 inch barrel.
Absolutely. The 140-grain weight and deep penetration capability make it effective on medium to large game. The solid copper construction won't fragment, ensuring you reach vitals. Many hunters prefer heavier bullets in the .357 for their penetration characteristics.
Yes. The nickel-plated brass is reloadable, and Underwood's nickel plating process is designed to withstand the stresses of magnum loads without cracking, making these casings safe and durable for handloaders.
| Caliber/Gauge | .357 Magnum |
|---|---|
| Case Material | Nickel-Plated Brass |
| Cost per Round | 2.30 |
| Grains | 140 gr |
| Length | 2.7000 |
| Manufacturer | |
| Manufacturer Part Number | 836 |
| Shipping Weight | 0.7 |
| Units per Box | 20 |
| UPC | 816874020170 |
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