Underwood 357 Mag 140gr - Xtreme Penetrator 20rd 10bx/cs

Underwood 357 Mag 140gr Xtreme Penetrator ammunition delivers purpose-built performance for law enforcement, defensive carry, and tactical applications where deep, consistent penetration is non-negotiable. This 20-round box format (10 boxes per case) provides practical quantities for duty rotation, training cycles, and field operations. Designed for shooters who demand reliable barrier-defeating capability in .357 Magnum, this load bridges the gap between standard velocity and premium performance without sacrificing controllability.

The 140-grain projectile weight is engineered to maximize velocity while maintaining structural integrity through intermediate barriers—drywall, auto glass, and heavy clothing. Xtreme Penetrator rounds utilize controlled expansion and hardened construction to prevent fragmentation, ensuring consistent energy transfer and deep wound channels in defensive scenarios. The ammunition is loaded to standard .357 Magnum pressures, making it fully compatible with all modern .357 Magnum revolvers and lever-action rifles rated for the cartridge. Consistent case construction and quality control ensure uniform velocities across the 20-round count, critical for group consistency and predictable point-of-impact shifts.

Duty officers, armed civilians, and serious sport shooters benefit most from Underwood's reputation for barrier-blind reliability—ideal for real-world carry applications where environmental variables demand over-penetration margins. The 10-box case structure suits law enforcement departments conducting qualification cycles or defensive trainers outfitting student cohorts. Recommended for use in any properly maintained .357 Magnum revolver, including modern tactical and service-grade platforms. Store in a cool, dry environment and handle according to all applicable ammunition safety protocols.