8.6BLK 300gn Subsonic ammo.  Loaded with Sierra 300gn MatchKing bullets in NEW Starline headstamp brass.   Great for running through suppressors, always subsonic.  Treat your new (or old) suppressor to some ammo made to run right.   

This is the ammo we demo with all our suppressors on range day or customer demos.  Save your brass and send it back for big discounts on loaded ammo.