Barnes TSX (Triple-Shock X) Bullet features include all-copper construction, no fragmentation, 28% deeper penetration than lead core bullets, and maximum weight retention. The TSX bullet has multiple, precisely engineered rings cut into the bullet shank, acting as relief valves while the bullet travels down the bore which results in improved accuracy, reduced pressures (for higher velocity loads), and less copper fouling. Series Hunting Weight 300 gr Quantity 20 Per Box Cannelure Yes Bullet Type TSX Flat Base Core Material Copper Solid Bullet Caliber 458 Caliber Bullet Diameter .458 Jacket Material Copper Solid Unit Of Measure box Recommended Usage Hunting Sectional Density .204 Bullet Tip Material Hollow Point