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Message: <blockquote data-quote="Mad Professor" data-source="post: 2920349" data-attributes="member: 5316">There is a difference between a powder load pushing a 208-240 grain projectile at ~1000 fps vs a load pushing a 110-125 grain projectile at ~2100 fps.  While there were many wildcat predecessors to the 300 AAC Blackout cartridge (whisper,  300 fireball, 300-221). Robert Silvers did quite a bit of research in developing the round to work with the AR gas system in many different load groups in developing the 300 AAC Blackout.  A1680 was chosen for the subsonic loads because it fills the case better at those loads while still producing enough gas to cycle the load. It is awesome for these rounds. While there is limited success with some other powders, A1680 is the preferred powder.   The supersonic rounds were developed around H110/W296. At one time there were suggested loads on AAC website. I'm not sure is they are still there. LiLGun was a secondary choice.1) Powders are not entirely universal. They will have a place where they work best. When possible, you want to pick powder that is working optimum during your intended use.  A 6 oz gunsmith hammer, a 16oz carpenters hammer, and a 2lb sledge hammer, may all get the same job done. But, if possible, you want to pick the best one for that particular job.  A1680 is the one for Subs. H110 hits the sweet spot at with higher pressures and lighter projectiles.2) When loading A1680 to toward recommended loads using a 125 bullet it gets compressed pretty quickly.  One of my data books show a MAX of 18.5 reaching a velocity of 1925 fps while another goes to 21.5 grains getting 2126 fps.  H110 EASILY makes 2000 fps and there are published loads closing in on 2300 fps.   ED and SD start to rise quickly with powders when they get to max.  Also ambient temps can really come into play.3)  H110 (or W296 which is the exact same powder) can be found locally for under $19-20lb.  A1680 can be found locally, but in my experience at a premium pushing $30lb.  I last ordered it from Powder Valley and it is currently $22lb there, + hazmat and shipping. 4) H110/W296 is more readily available.  I spent 6-7 months looking for A1680 last year but could easily find H110. Do what you choose, but you can make much quicker progress by using the experiences of others that have been down the same path.</blockquote>

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