Atomic Rifle Subsonic 300 Blackout 220 Gr Hollow Point Boat Tail 50 Bx/ 10. Specifications for Atomic 00465 Rifle Subsonic 300 Blackout 220 Gr Hollow Point Boat Tail 50 Bx/ 10: Manufacturer: Atomic Ammunition Caliber: .300 AAC Blackout Number of Rounds: 50 Bullet Type: Boat Tail Hollow Point (BTHP) Bullet Weight: 220 grain Cartridge Case Material: Brass Muzzle Velocity: 1050 ft/s Application: Match Primer Style: Centerfire What is Atomic 00465 Rifle Subsonic 300 Blackout 220 Gr Hollow Point Boat Tail 50 Bx/ 10 good for? The manufacturer suggests that it is best for match.