Hunting ammunition for medium game and larger animals needs to have superior penetration ballistic properties to overcome dense muscle and possibly bone in order to strike vital organs. Underwood Xtreme Penetrator ammunition uses Lehigh Defense's masterfully designed solid copper (lead free) projectiles of the same namesake. These uniquely shaped bullets increases hydraulic velocity which allows a larger permanent wound channel while maintaining reliable magazine feeding for follow up shots. On your next hunt or hike, keep Underwood Xtreme Penetrator ammunition handy.