Atomic Ammunitino's 10mm Automatic ammunition is designed to hit hard, penetrate deep and expand to 150 percent of its original diameter. This bullet regularly expands to .70 inches, retains 99 percent of its original mass and penetrates more than 15 inches of ballistic medium. It is assembled to exact specifications with commercial-grade machinery and is designed to deliver the accuracy that precision shooters demand. Specifications: 10mm Auto/180 gr/ Bonded Match Hollow Point/20 Per Box/10 Cs