Prvi Partizan Subsonic Rifle Ammo 300 Blackout 220 Grain Full Metal Jacket Boat Tail 20 Round Box. The new Subsonic Line ammunition is manufactured to strict quality production standards and will exceed all expectations. Subsonic ammunition has been in use by military law enforcement and training because of its lower noise and lower recoil benefits. Give it a try yourself and experience the benefits firsthand and see why subsonic ammunition is gaining popularity with shooters. Specifications for PPU Subsonic 300 Blackout 220 Grain Full Metal Jacket Boat Tail 20 Round Box: Manufacturer: PPU Caliber: .300 AAC Blackout Number of Rounds: 20 Bullet Type: Full Metal Jacket Boat Tail (FMJBT) Bullet Weight: 220 grain Cartridge Case Material: Brass Application: Hunting Target Training Package Type: Box Primer Style: Centerfire Features of PPU Subsonic 300 Blackout 220 Grain Full Metal Jacket Boat Tail 20 Round Box: 220 Grain Package Contents: PPU Subsonic 300 Blackout 220 Grain Full Metal Jacket Boat Tail 20 Round Box