For hunting, the HSM .300 AAC Blackout 125gr GameKing, 20-Round Box (brand part no. 300BLK3N) gives HSM shooters a .300 AAC Blackout option that is built to put big game down cleanly and ethically. Each round drives a 125-grain Sierra GameKing boat-tail bullet. It is a dependable option for anyone stocking up on rifle ammunition. HSM backs the load with consistent quality control from lot to lot, so what you pattern or zero with today is what ships in the next case.

Key Specifications

• The chambering is .300 AAC Blackout, a chambering with the reach and energy for deer-sized game and larger.
• The bullet weighs 125 grains, enough mass to drive deep and transfer energy on game.
• The bullet is a Sierra GameKing boat-tail, the terminal design behind the load.
• The boat-tail base trims drag for a flatter trajectory at extended range.
• The case is Brass, the reliable standard for consistent chambering and reloading.
• Each box holds 20 rounds, plenty to sight in and still head to the stand with a full load.
• Cost per round runs about $1.41, useful for budgeting a range day or a season of practice.
• A case holds 25 boxes (500 rounds total), letting you order in bulk without repeat checkouts.

Frequently Asked Questions

What game is the 125gr Sierra GameKing boat-tail suited for? With .300 AAC Blackout performance behind a Sierra GameKing boat-tail, it’s well matched to deer-sized game.

Does the Sierra GameKing boat-tail bullet expand on impact? Yes, it’s engineered to expand reliably on impact for a wider wound channel and faster energy transfer.

What is the case made of? It uses a brass case, the reliable standard for consistent chambering and reloading.

HSM .300 AAC Blackout For Sale

Confirm your zero with a few rounds before the season opens, then trust this load on the shot that matters. Browse more rifle ammunition while you shop, or add this load to your cart now. Order from our Lubbock, Texas gun shop and it ships fast to your door.