Fort Scott Munitions TUI .243 Winchester 70 Grain Centerfire Rifle Ammo offers an incredible patented design that excels in penetration and increased effect on target. TUI uses a match-grade, 70 grain, solid copper bullet designed for use while hunting and self defense. TUI Tumbles Upon Impact creating a large wound cavity. Upgrade your ammo today with Fort Scott Munitions TUI ammunition. Solid copper TUI bullet Tumbles upon impact Excellent penetration