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Federal Premium Personal Defense HST Ammunition has been specially designed to deliver consistent, tremendous expansion, optimum penetration and superior terminal performance. The specially designed hollow point will not plug while passing through a variety of barriers and the jacket and core hold together providing nearly 100% weight retention! This ammunition was engineered to meet or exceed ammunition testing protocols; these protocols put bullets through 10% ordinance gelatin, steel, wallboard, plywood, laminated automobile safety glass and gelatin covered in heavy clothing and measure how well the bullets penetrate, expand and hold together. Extensive testing has shown that the on average the 40 S&W load will deliver 12.42″ of penetration, 0.77″ of expansion, 94% weight retention through all FBI barriers when shot through a Glock 22 at 10 feet.