Unlike conventional FMJ bullets that leave lead exposed at the base, Speer TMJ uses Uni-Cor technology to completely encase the lead core in a seamless jacket. It's cleaner, more accurate and more consistent than any FMJ. Features: Uni-Cor technology completely encases the lead core in a seamless jacket Design eliminates the accuracy-robbing features of conventional full metal jacket bullets Reduces fouling and airborne lead Consistent bullet diameters and a uniform heel