One of the main reasons that the US Military was looking for a replacement round for 5.56 NATO was the loss of energy and velocity by the 5.56 NATO round as it was fired through barrels that were increasingly getting shorter. In its subsonic loading it has been compared with both subsonic 9mm and 45 ACP.
In its standard form as a subsonic round, 300 Blackout most closely resembles the 7.62 x 39mm round first used in the SKS and AK-47 rifles of the former Soviet Union. This is always a good sign with regard to the longevity of an ammunition cartridge in the market. Another positive note is that 300 Blackout and the original 300 Whisper cartridge are completely interchangeable from barrels to reloading dies as well as reloading components and specifications.Īs a result of its popularity we have even seen the retail price of 300 Blackout ammunition decrease over time. The improved design means that it will work with a standard AR15 or M16 bolt and magazines with the only real part change being the barrel. They normalized different load data and submitted the new cartridge to SAAMI (Small Arms Ammunition Manufacturers Institute) and CIP (Permanent International Commission for the Proof of Small Arms) for standardization and christened the new round 300 AAC Blackout by CIP and 300 BLK by SAAMI. Remington and AAC changed the design slightly by using trimmed and expanded 5.56 NATO brass as opposed to 221 Fireball or 222 Remington as the parent case. It seemed as if the round was doomed to die in the “also-ran” wildcat category until the Federal Assault Weapon Ban was allowed to sunset in 2004 and a company called Advanced Armament Corporation (AAC) began to show interest in the 300 Whisper.ĪAC was eventually bought out by Remington Defense and the two companies worked on the design as a potent new caliber that could address perceived shortcomings with the 5.56 NATO round. National Firearm Act laws governing the sales of silencers were also misunderstood at the time and silencer ownership was a mere sliver of what it is today. The 1994 Federal Crime Bill and Assault Weapon Ban did not help the subsonic cause, either, as threaded barrels on semi automatic rifles made them subject to the ban. Unfortunately, the round was trademarked by SSK and other manufacturers were unable to manufacture barrels or even brass and dies for the round. By varying the load, lighter bullets could be fired at supersonic levels with the power of the Soviet 7.62 x 39 or used with heavier bullets at a subsonic level for use with a sound suppressor. Jones formed the brass from 221 Fireball cases expanded to take a. The 300 Blackout round has its roots in the 300 Whisper cartridge designed by JD Jones of SSK Industries in the early 1990s. Want to skip ahead in the guide? Use the links below: It may not be the be-all and end-all cartridge, but for most shooters and hunters, 300 Blackout is worth taking a second look at. This relatively new cartridge has been around a bit longer than some might think and has its share of fans and detractors, but 300 Blackout has more than proven itself as a hunting, defensive and target round in that time. It has since become one of the most popular rounds to use with a suppressor. It was designed to be used in AR-pattern rifles with only a barrel change to convert a traditional AR-15 rifle from 5.56 NATO. Groups do not seem to close up again until hitting the 180 grain mark.One of the hottest new rounds to emerge in the past few years is 300 Blackout this is a true dual-purpose intermediate sized cartridge that can be fired in both subsonic and supersonic loads. Also the modern subsonic specific bullets with petals and huge hollow points would seem to require a "supersonic" approach to use where "subsonic" loading is more like black powder cartridge.Īt supersonic, I have used 125 grain Nosler BTs out to 700 yards with good effect but struggled with mid range weights. There has been a tendency to move towards 1/7 and I can see the logic for flight stability given it should/should make the bullet even more unstable when it hits. This was unlike the 210 Berger which was too stable and ended up producing multiple needle point holes. I have had 240s pull internal material out on their journey. The ideal exit hole should look like a knife wound. When it hits a target, to get best effect, you want it to start tumbling within an inch. They need to be stable in flight but then turn rapidly unstable upon hitting an object. The whole point of conventional heavy bullets leaving the barrel at 1050fps is that they should exist on the ragged edge of stability.
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