The Barnes Triple-Shock X-Bullets in .22 caliber (0.224") are revolutionary hunting bullets made from 100% copper construction. These 55-grain flat base bullets are designed to expand upon impact producing four razor-sharp petals with exceptional cutting capability.Barnes Triple-Shock X .22 Caliber Bullets - 50 per box55-grain flat base design100% copper construction for lead-free performanceExpands into four razor-sharp petals on impactRetains 100% of original weightPenetrates dense bone and tissue effectivelyOptimal seating depth: 0.03 to 0.07 inches off the landsEngineered for hunters who demand one-shot kills these bullets deliver superior penetration through dense bone and tissue while maintaining their full weight for maximum terminal performance on big game.