Barnes VOR-TX 300 Winchester Magnum 165gr TTSX BT Rifle Ammo - 20 Rounds - These all-copper bullets provide destructive power, double-diameter expansion, maximum weight retention, and devastating energy transfer - all with excellent accuracy. Multiple Grooves In The Bullet's Shank Reduce Pressure & Improve Accuracy Bullets Open Instantly On Contact No Other Bullet Expands As Quickly Lead Free