Underwood 357 Sig 125gr Bonded - Jhp 20rd 10bx/cs

The Underwood 357 Sig 125gr Bonded JHP is purpose-built ammunition for law enforcement, armed security, and civilian defensive carry applications where terminal performance and barrier penetration are non-negotiable. This round delivers the velocity and energy density demanded by the 357 Sig platform while maintaining controlled expansion in real-world defensive scenarios. Underwood's reputation for consistent quality and forensic-grade reliability makes this load a trusted choice for professionals who understand that ammunition is the foundation of any defensive system.

The 125-grain projectile employs a bonded construction—a metallurgically fused core and jacket—that prevents jacket separation during penetration, ensuring consistent weight retention and energy transfer through intermediate barriers including automotive glass, sheet metal, and heavy clothing. This bonding technology is critical in duty applications where a round may encounter multiple barriers before reaching soft tissue. The 357 Sig's inherent velocity platform amplifies the terminal effects of the bonded design, delivering velocity in the range that maximizes the JHP expansion envelope while maintaining sufficient penetration depth to meet FBI protocol standards of 12–18 inches in ballistic gelatin.

This ammunition is optimized for firearms chambered in 357 Sig, including duty-grade handguns from SIG Sauer, Glock, and other manufacturers rated for the cartridge. The 20-round box format allows practitioners to maintain practice volumes and duty loads without excessive per-round cost, while the 10-box case structure supports both individual shooters and small teams or departments. Shooters should verify function in their specific platform through controlled live-fire testing before relying on any defensive round, as firearm-specific performance variations can occur even within the same caliber platform.