Fort Scott Munitions TUI 243 Winchester 58gr SCS Centerfire Rifle Ammo - 20 Rounds - Fort Scott Munitions TUI ammo is a match-grade bullet made of solid copper and engineered to Tumble Upon Impact providing devastating stopping power. While designed as precision ammo for rifle hunters, Fort Scott's multi-patented TUI technology also makes them ideal rounds for home and self-defense or law enforcement.