Cor-Bon's DPX .357 Magnum ammunition features a revolutionary 125-grain solid copper bullet designed for superior defensive performance with 1 300 feet per second muzzle velocity.357 Magnum caliber ammunition125 Grain DPX (Deep Penetrating X) bullet100% solid copper construction with internal serrationsBarrier-blind performance - maintains 100% weight retention1 300 feet per second muzzle velocityExpands to double diameter with 6 razor-sharp petals20 rounds per boxEngineered for law enforcement and personal defense applications this ammunition delivers exceptional penetration through barriers like auto glass and steel while providing reliable expansion for maximum stopping power.