Everything else I've read pretty much says that A1680 is good to go on subsonics both suppressed and unsuppressed out of factory AAC uppers. Thanks - This is exactly what I was looking. Lil gun works also but I have found AA1680 to cycle stronger and more reliably than Lil gun especially when the gun gets dirty. You may be thinking of VV110 which will but is not readily available.ĪA1680 is the most widely used and most reliable powder for subsonics. H110 is the go to powder for supersonic but will not cycle subsonic ammo in a barrel that is labeled 300BLK. The first wildcat round, 300 Whisper had an oversived gas port that would allow lower gas powders to work subsonic but supersonic was out of the question. Then determine if it is whisper or 300BLK as the chamber is different much like.
The reason AAC recommends AA1680 is that it gives a high volume percentage of fill and creates enough back pressure to reliably cycle the bolt in all four circumstances.įellow members, please review the data you search for and determine if it is for a bolt gun or ar platform. Also, the cartridge was designed with a pistol length gas system in mind for SBR applications, so I could see that being an issue with the 16" barrel, but not the 9.5". I use Lil'Gun for my supers in the 125gr range and I get an average velocity of 2350fps from my 16" barrel with it.įor subs I use 1680 with hornady 225gr and with Lee Cast bullets from their 300blk mold.ĪAC recommends using an H2 buffer for the Blackout. I could not get H110 to cycle my 9.5" or 16" barrels when loaded to Subsonic velocities.
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