The world of ever expanding anti terrorism and special operations missions the need for an effective round that works well in close quarters and out to 300 meters is of critical importance. The standard round for years has been the 5.56x45mm in some configuration, BUT is the .300 AAC Blackout really the ultimate CQB round hiding in plain sight? It’s a question being asked more often now.

The .300 AAC Blackout was developed as a joint venture between Remington’s Defense section and Advanced Armament Corp. The round itself was developed off of the older .300 Whisper, a wildcat round that uses the .221 Fireball / .223 Remington cartridge. The .300 Whisper was a project from the early 1990’s and due to a unfortunate series of issues largely fell flat and never had any SAAMIspecifications accepted for standardization of the round. It wasn’t a total loss for the firearms industry though, some people took notice of the ballistics that were achieved.

The point of this article is not to lull you to sleep with the history of the .300 AAC Blackout and its parent case or pervious attempts at developing a similar round. History is important, it gives us a ground work to understand the development of a project. Fast forward to to the 2008-2010 time frame, a lot of the news media and reports coming out of Iraq and Afghanistan were of close quarter contact and house to house raids being the standard operating procedures.

Armed conflict makes people and countries look at their equipment and analyze what works and what doesn’t, its part of survival of the fittest. Anyone who can read ballistics charts, has analytical skill can quickly figure out that a round designed for medium to long range shooting might not be the best tool for room to room fighting. This thought process had to be on the minds of engineers at Remington and Advanced Armament Corp when the .300 AAC Blackout idea was born.


Parent Case: .221 Fireball/.223 Remington

Bullet Diameter: .308″

Case Length: 34.7 mm