This is 357 Mag Corbon DPX 125gr. Hollow Point Ammo. Corbon products have earned a distinctive reputation in the industry with their high energy JHP ammunition. They maintain that standard with this new DPX line, it has a deeper penetration to make it the optimum load for Law Enforcement and civillian use. This ammo is loaded with the Barnes X Bullet, which retains 100% of its weight, even after shot through barriers such as clothing and steel. The permanent crush cavity is considerably larger than a typical hollow point due to deeper penetration. The Barnes X-Bullet is a solid copper projectile, heat treated for extra toughness. There's no separate jacket and no lead core. The bullet holds together for deep, dependable penetration---every time! A deep forward cavity causes the nose to peel back in four separate, razor-edged petals. Viewed head on, the appearance of these four petals gives the X-Bullet its name.