![]() 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. Lots and lots of guys on 300blktalk have played with 1680 and CFE BLK for heavy supersonics so might want to take a look at their experiences.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. You can play a little bit, try loading them at 2.22" and see if they feed and cycle fine, it'll allow you a slightly higher charge and lower pressure. Well it'll really depend on your COAL, because AA1680 and CFE BLK don't mind being slightly compressed but you'll have to watch for pressure sign.ġ68 SMK 2.18" 19.2 - 19.7 -> Be careful 19.7 is max book load.ġ75 SMK 2.18" 17.8 - 18.4 -> 18.4 is max load. Obviously a good chrono is a must when loading subsonics. I prefer to be in the 980-1020FPS range but some people like to be in the 1040-1060 range, it really depends on your outside air temperature. Now I can run Lapua 200gr with 8.3 gr 2.15" OAL and still be in the magic 1000-1020 FPS range and hold the bolt on last round.įor 220 GR with N110, start at 9.0-9.5gr and work your way down to 8.0-8.5. ![]() Stock I couldn't get it to cycle reliably with those fast powders unless I used heavy SMK 240s and run them in the 1080fps range. My 10" Noveske has no issues now that I use a JP SCS with the tuning kit and Faxon Low mass BCG. If you have a can, it'll help a lot, otherwise it might still work depending on your GB port size, BCG and buffer balance. But n110 is a faster powder than 1680 or CFE BLK so you're on the edge of reliability for a typical 300blk gasser.
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