Product Description Underwood Ammo .357 Magnum 140gr Xtreme Penetrator ammunition pairs Underwood&&';;s high-performance loading with Lehigh Defense&&';;s CNC-machined, solid copper (lead-free) bullet design to deliver extremely deep, straight-line penetration. The distinctive fluted nose is engineered to maximize hydraulic pressure in soft tissue while maintaining consistent feeding. Built with nickel-plated brass casings and flash-suppressed powder, this is a premium choice for hunting and self-defense applications. Product Highlights 140-grain Xtreme Penetrator solid copper (lead-free) bullet for deep, straight penetration Fluted/blunt-nose profile designed to increase hydraulic effect while supporting reliable feeding Nickel-plated brass cases for enhanced corrosion resistance and smoother cycling New production, non-corrosive, boxer-primed, reloadable brass construction Flash-suppressed powder helps preserve night vision in low-light use Specs Brand Name: Underwood Ammo Cartridge: .357 Magnum Bullet Weight: 140 grain Bullet Type/Design: Xtreme Penetrator, solid monolithic copper (lead free) Case: Nickel-plated brass Primer: Boxer Corrosive: No Reloadable: Yes Rounds Per Box: 20 Test Barrel Length: 6 in (listed) Muzzle Velocity: 1550 fps (listed) Muzzle Energy: 747 ft-lb (listed) Country of Manufacture: USA (listed) UPC: 816874020170 Manufacturer Part Number: 836 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.