Unlike conventional FMJ bullets that leave lead exposed at the base Speer uses Uni-Cor technology to completely encase the TMJ bullet?s lead core in a seamless jacket. It?s cleaner more accurate and more consistent than any FMJ. 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