This is .308 Win Australian Outback 168gr. Sierra MatchKing Hollow Point Boat Tail Ammo. The only ammunition with Ballistic Temperature Independence (BTI) technology. No matter if it's scorching hot or freezing cold, Australian Outback ammunition delivers consistent extreme high velocity and accuracy in all shooting conditions. For serious rifle competition, you’ll be in championship company with MatchKing bullets. The exacting tolerances assure record-breaking accuracy you can depend on. This ammo is brass cased, boxer primed, non-magnetic and non-corrosive. This ammo comes packed in 20rd. boxes.