Hornady .310 123 gr InterLock SP Projectiles 2800 PackOur traditional line of bullets feature exposed lead tips for controlled expansion and hard hitting terminal performance. Most have our pioneering secant ogive design one of the most ballistically efficient profiles ever developed (see diagram to right). Most feature our exclusive InterLock design a raised ring inside the jacket that is embedded in the bullets core that keeps the core and jacket locked together during expansion to retain mass and