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Thread: 300 Blk SUB 247 RN

  1. #1
    Boolit Bub thegasharkman's Avatar
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    May 2012
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    300 Blk SUB 247 RN

    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
    Last edited by thegasharkman; 04-17-2021 at 04:50 PM.
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  2. #2
    Boolit Buddy pacomdiver's Avatar
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    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

  3. #3
    Banned
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    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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  4. #4
    Boolit Buddy pacomdiver's Avatar
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    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
    Click image for larger version. 

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    Last edited by pacomdiver; 04-18-2021 at 07:11 PM.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check