Federal MSR 300 Blackout 190 Grain Subsonic Expanding Brass Cased Rifle Ammo 20 Rounds. Its a highly adapted hunting machine and it needs ammunition thats just as customized: Fusion MSR. From primer to projectile virtually every component is optimized for use in modern sporting rifles and peak ballistic performance through short barrels. Specifications for Federal MSR 300 Blackout 190 Grain Subsonic Expanding Brass Cased Rifle Ammunition: Manufacturer: Federal Caliber: .300 AAC Blackout Number of Rounds: 20 Bullet Type: Subsonic eXpanding (Sub-X) Bullet Weight: 190 grain Cartridge Case Material: Brass Application: General Package Type: Box Primer Style: Centerfire Bullet Tip Material: Polymer Features of Federal MSR 300 Blackout 190 Grain Subsonic Expanding Brass Cased Rifle Ammunition Clean-burning low-flash fast-burning propellants boost velocity through typical-length MSR barrels Primer compatible with rifles that have free-floating firing pins Military-style colored case iris gives visual confirmation of proper case metallurgy Molecularly-fused jacket around a pressure-formed core produces excellent accuracy Package Contents: Federal MSR 300 Blackout 190 Grain Subsonic Expanding Brass Cased Rifle Ammunition What is Federal MSR 300 Blackout 190 Grain Subsonic Expanding Brass Cased Rifle Ammunition good for? The manufacturer suggests that it is good for general.Federal F300BMSR3: MSR 300 Blackout 190 Grain Subsonic Expanding Brass Cased Rifle Ammo 20 Rounds