Sako Sierra MatchKing .300 Blk 220 Grain Brass Cased Rifle Ammo 10 Rounds JAG3BLK/22B. All components of the TRG cartridge line are selected for ultimate consistency and accuracy. TRG Precision cartridge manufacturing follows the stringent Sako quality standards which involves an all-new accuracy testing process. Specifications for Sako Sierra MatchKing .300 Blk 220 Grain Brass Cased Rifle Ammunition: Manufacturer: Sako Caliber: .300 AAC Blackout Number of Rounds: 20 Bullet Type: Open Tip Match (OTM) Bullet Weight: 220 grain Cartridge Case Material: Brass Application: Target Package Type: Box Included Accessories: None Primer Style: Centerfire Application: Target Package Contents: Sako MatchKing .300 Blackout 220 Grain Brass Cased Rifle Ammunition What is Sako Sierra MatchKing .300 Blk 220 Grain Brass Cased Rifle Ammunition good for? The manufacturer says that it is best for target.Sako JAG3BLK/22B: Sierra MatchKing .300 Blk 220 Grain Brass Cased Rifle Ammo 10 Rounds