This bullet was designed for the 50BMG rifle, the 660gr specifically the Barrett M82A1. This MTAC line is machined out of lead free solid copper bar stock on a CNC swiss lathe. These are a high BC, solid bullet designed exclusively for target use at all ranges. A unique feature of this bullet is Cutting Edge's patented SealTite(TM) band which is a band slightly larger than caliber diameter around the bullet which was designed to eliminate fliers by preventing gas blow-by. The SealTite(TM) band also decreases copper fouling which is typically associated with mono metal bullets. Mfg: Cutting Edge Bullets