Underwood Ammo Rifle Ammunition Features The Underwood Ammo .223 Rem load is built around a solid monolithic lead-free bullet a design born from an animal control agency s request for a projectile that creates extensive wound trauma while minimizing pass-through energy. Unlike copper matrix frangible projectiles which the requesting agency found lacking in penetration depth and particle size this bullet is engineered to penetrate to a controlled depth before fracturing. As internal hydraulic pressure exceeds the hoop strength of the nose design the bullet bursts into numerous particles creating many individual wound channels and a large temporary cavity near the central nervous system with proper shot placement. At the moment of fracture a massive energy spike is released as the particles break away and radiate outward from the bullet s original trajectory path. This energy spike sends a shock wave through the target s circulatory and nervous systems rapidly shutting down the functioning parts of those systems for fast effective results. Loaded to 62 grains and launched at 3100 fps for 1323 ft lbs of muzzle energy this is a supersonic round rated for use on medium game. Underwood Ammo .223 Rem Solid Monolithic ammunition is available for sale at GrabAGun in boxes of 20 rounds for hunters who want a proven lead-free terminal performer. Underwood Ammo Rifle Ammunition Specifications Manufacturer: Underwood Ammo Caliber: .223 Rem Rounds Per Box: 20 Bullet Weight: 62 gr Bullet Type: Solid Monolithic Muzzle Velocity: 3100 fps Muzzle Energy: 1323 ft lbs Ballistic Coefficient: 0.28 Sectional Density: 0.18 Application: Medium Game Rating: Supersonic Available At: GrabAGun