The Hornady’s Frontier Cartridge .300 AAC Blackout 125gr Full Metal Jacket Ammunition, 20-Round Box (part no. FR400) is built by Hornady for range, training, and varmint use. Frontier Cartridge is Hornady’s American-made, military-grade line, built from Lake City brass and mil-spec components for shooters who train often. Find it alongside our rifle ammunition selection for shooters who want confirmed specs, not distributor guesswork.

Key Specifications

• The chambering is .300 AAC Blackout, matching guns built for range, training, and varmint use.
• The bullet weighs 125 grains, setting the load’s balance of velocity and terminal performance.
• The bullet type is Full Metal Jacket, defining how it performs on impact.
• The case is Brass, resisting corrosion for reliable feeding.
• Each box holds 20 rounds, enough for a serious range session.
• Frontier loads use Lake City brass cases, the same military-grade brass sourced from the U.S. Army’s Lake City arsenal.
• The line runs military-grade boxer primers and propellant for consistent ignition across high-volume shooting.
• The box ships at roughly 0.75 lb, confirmed factory packaging weight for this quantity.
• Cost works out to about $1.01 per round, a reasonable cost for this level of quality.

Frequently Asked Questions

What is Frontier Cartridge? Frontier is Hornady’s American-made, military-grade ammunition line built on Lake City brass for shooters who train and shoot often.

Is this a hunting or range round? The full metal jacket bullet does not expand, making it suited to target shooting, training, and varmint use rather than big-game hunting.

Buy the Hornady’s Frontier Cartridge .300 AAC Blackout 125gr Full Metal Jacket Ammunition, 20-Round Box

American-made on Lake City brass, it is built for the shooter putting rounds downrange every week. Ships fast from a Lubbock, TX gun shop.