The Hornady Interlock 123-Grain SST Bullets feature a streamlined design for ultraflat trajectories and polymer Super Shock Tips® (SST®) for rapid expansion and maximum energy transfer upon impact. Match-grade copper jackets deliver surgical accuracy, while heavy construction with Interlock® rings deliver deep penetration and dramatic wound channels. Copper bullet coatings. Hornady Interlock 123-Grain SST Bullets - 100 Rounds - Reloading at Academy Sports