From The World Firearm Ammunitioner In Ammunition, Federal Fusion became a legend in the deer woods for a reason. Its pressure-formed Firearm Ammunition core is molecularly bonded to a consistent copper jacket, resulting in the highest weight retention, deepest penetration and best expansion in its class. We've written a new chapter to the Fusion story with Fusion Tipped. The design offers the same great terminal performance as the original, but with a polymer tip that increases ballistic coefficient, flattens trajectories and boosts energy for better accuracy and extended effective range.