Barnes Bullets 300 AAC Blackout 120gr HP Rifle Ammo - 20 Rounds - This lead-core 300 Blackout Ammo is carefully engineered for maximum versatility. The 120-grain Jacketed Hollow Point Flat Base (JHP FB) Barnes bullets have an excellent ballistic coefficient and sectional density to optimize the terminal performance.imageBarnes is known for top-quality ammunition and reloading components. This rifle ammunition is no exception. Perfect for hunting varmints and predators, it also serves well in defensive scenarios. The impressive performance on the range means you can trust it in the field.