Speer TMJ bullets are built for precision. With Uni-Cor technology wrapping the lead core in a perfectly uniform copper jacket, you get exceptional balance, superior accuracy, and consistent performance at the range or in competition. 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