I've developed a load that is subsonic and cycles the action in my DSA SA58 FAL rifle. The rifle is a carbine, 16" barrel, full length gas system. I've tested this load over multiple rounds and it works. I don't have crono data yet, am simply going by ear (no supersonic crack). I've tried it with and without a silencer. The load: *** Varget and then a**** gr Trail Boss powder on top. This fills the cartridge to the bottom of the neck and produces a lightly compressed load. No signs if pressure at all. The bullet I'm using is Hornady 180 gr SP Interlocks (flat tail/base). This load has also worked with other bullets I've tried like Hornady 168 gr A-max. I've been using magnum primers to get some extra oomph but will switch to normal primers when they're used up. Starting off I found it was impossible to load enough Trail Boss into the cartridge to go supersonic or cycle the action (all the way to the rim and compress loading the bullet). I then started with *** Varget and *** Trail Boss and kept incrementing the Varget by ***, reducing the Trail Boss to always end at the base of the case neck. The final load that worked well for me was what I posted above.