The TSX was introduced in 2003 and has become Barnes' most popular hunting bullet. The TSX has gained worldwide recognition as one of the deadliest, most dependable bullets you can buy. Try these all-copper bullets and realize the added benefits of improved accuracy, reduced barrel fouling and increased velocity. All copper construction Sleek profile and precision heel radius in FB and BT designs Accu-Groove technology for decreased fouling and top accuracy Devastating terminal performance 1:10 inches or faster twist rate