Lehigh Defense Maximum Expansion 300 Blackout 194 Grain Fracturing Tip BTHP Rifle Ammo 20 Rounds. These cavernous hollow points are designed to expand upon contact with a fluid-based medium through hydraulic energy. They do not expand on dry mediums like wood drywall bone or sheet metal. Specifications for Lehigh Defense Maximum Expansion 300 Blackout 194 Grain Fracturing Tip BTHP Rifle Ammunition: Manufacturer: Lehigh Defense Caliber: .300 AAC Blackout Number of Rounds: 20 Bullet Weight: 194 grain Additional Features: Boat Tail Hollow Point Features of Lehigh Defense Maximum Expansion 300 Blackout 194 Grain Fracturing Tip BTHP 20 Round Box: Muzzle Velocity: 1050 Feet Per Second out of 16 Barrel" Package Contents: Lehigh Defense Maximum Expansion 300 Blackout 194 Grain Fracturing Tip BTHP 20 Round Box