Unlike conventional fmj bullets that leave lead exposed at the base, speer uses uni-cor technology to completely encase the tmj bullets lead core in a seamless jacket.It is cleaner, more accurate and more consistent than any fmj.Coefficient: .157Bullet Type: Total Metal Jacket (TMJ)Bullet Diameter: .500Weight: 300 grBullet Caliber: 50 CaliberJacket Material: CopperCore Material: LeadCannelure: NoSectional Density: .171Quantity: 50 Per BoxRecommended Usage: Target