300 Blk SUB 247 RN

[thegasharkman]

I am loading these 247GN RN NOE with 9 grains of H110 for a suppressed 8.5" SBR AR15
Does anyone know the minimum powder charge. I don't have a chronograph to determine how far they are above the sound barrier. These seem a little loud compared to a factory subsonic through the same can.See Bullet (https://drive.google.com/file/d/16D53r6RV-IjTXXvijGG2_4ezQYgvbqRU/view?usp=sharing)

[pacomdiver]

8.1 h110 in LC cases and CCI srp in a 10.5 pistol gas system cycle 100% and it quieter than factory 220 subs

[Conditor22]

the best I've found for that boolit suppressed in a SS is 700X 4grn 4.7 in an ar with a pistol length buffer tube. it makes more noise hitting the metal than at the barrel

+1 on 8.1 grns H110

also had good results with 2400 & 1680



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[pacomdiver]

same load also shoots good thru a rem 700 AAC SD, complete darkness, 75 yards, wraith night scope , supressed. the thump as it went thru the 3" wood backstop was the loudest thing. group took 43 seconds to shoot
ETA: sized .311, pc'd with smokes signal blue
281512