Say goodbye to lead fouling. Speer TMJ bullets use exclusive Uni-Cor construction that completely seals the lead core in copper, unlike standard FMJ designs. Enjoy cleaner shooting, easier cleanup, and better barrel life. The lead core is fully enclosed within a seamless jacket using Uni-Cor technology The design removes the elements that typically reduce accuracy in standard full metal jacket bullets Minimizes fouling and airborne lead Uniformity in bullet diameters and a consistent heel