Description Atomic Ammunitionâs 300 Blackout 220 GR SIERRA HPBT MATCH KING LOADED IN NEW BRASS is made with only the very best components available, such as new, reloadable brass cases, Hodgdon powder and Sierraâs world famous MatchKing Hollow Point Boat Tail bullets. This ammunition IS specifically designed to cycle semi and fully automatic weapons! Sub-Minute of Angle Accuracy in high quality rifles with capable users. Sierra MatchKing bullets have very thin jackets and are held to exacting tolerances in diameter and weight. These Hollow Point Boat Tail bullets have a small meplat to produce a higher ballistic coefficient. Their accuracy has been acclaimed worldwide and they have been used to win more target competitions than all target bullets from other manufacturers combined. The 30 Grain 220 Grain MatchKing is widely respected as one of the most accurate bullets available. It has been used to win countless championships and set numerous world records in various long range shooting competitions. Firearms, trailers, and some accessories are only available for purchase in stores. Each location follows all BATF and individual state/county/city laws to insure the desired product is legal for sale. Any info provided online is subject to change, please go to your local store for more accurate information.