NOTE: Users assume all risk, responsibility and liability whatsoever for any and all injuries (including death), losses or damages to persons or property (including consequential damages), arising from the use of any data, whether or not occasioned by publisher’s negligence or based on strict liability or principles of indemnity or contribution. Chrony readings coming soon are here and I had no problems dinging a 100yd target with these without hold-over. No bolt hold-open on either upper, but that could be the PMAGs I used. ![]() Performance:This recipe successfully cycles both a carbine length upper (and gas system) with a 16″ barrel and also a 9″ pistol length upper, no suppressor. I still use CCI #400 primers, although you should note that these primers are a little soft so CCI #41 primers are best. I recommend using LC brass when possible as I find its the most consistent. Recipe created and tuned using a Lee Precision 4-hole Turret Press with double-disc powder throw and load both factory BLK brass and 5.56 brass trimmed to 300BLK specs. More alternatives here– I plan to work on IMR options next. Also LilGun requires less charge per round than 1680– so it’s even more efficient– it’s my new preferred powder. ![]() Slowly the truth is getting out there- and I can now personally confirm success with LilGun as an alternative to 1680 for subsonic BLK loading. The Interweb phenomenon took hold and now there is a false impression that 1680 is the only powder that works for subsonic AAC Blackout loads. ![]() When I started researching recipes for 300 BLK subsonic loads the recommended powder was Accurate 1680.
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