100.177 caliber Lethal pellets. The LETHAL pellet can acquire up to 38% better grouping than a standard lead pellet, thanks to the stable trajectory and its longer polymer skirt. The dome tip and the two body design enable this pellet to penetrate a metal plate up to 0.06 in (0.15 cm) thickness. 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. Model# 632274054. Gamo is the world's largest manufacturer of air gun pellets. Our goal is to produce the most accurate air gun ammunition money can buy. To achieve this goal we use state-of-the-art manufacturing techniques, Gamo pellets are consistently monitored to the strictest standards to ensure consistent shape and highest quality. Each pellet type is tested through actual firing of random lot samplings. If a lot groups outside of 7/8" of an inch at 10 or 25 meters the entire lot is discarded..