.177 cal. PBA Bullet - A PRECISION NON-LEAD HUNTING PELLET WITH TRUER FLIGHT LONGER SKIRT & GREATER PENETRATION. Copper retains 100% of its weight after expansion retaining velocity/energy - creating less ballistic drag. The shape and long skirt create a flatter trajectory and tighter group patterns. Terminal impact for a clean vital shot kill. The PBAA(R) Bullet produces 30% More Terminal Impact.