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Thread: Subsonic 300 Blackout Powder Options

  1. #1
    Boolit Master

    Join Date
    Nov 2009
    Greenville, NC

    Subsonic 300 Blackout Powder Options

    I am working on a low velocity/subsobsonic load for a 230 grain cast boolit in a 300 Blackout on an AR-15 frame. I have, based on thread search, tried 9.5 grains of H-110 and the gun runs like a charm. Now for the problem, I am running out of H-110 powder. Result indicates that Accurate 1680 is a very good choice for this round. Recognizing that I may not be able to find Accurate 1680 anytime soon, I need to find a powder that will work.

    There is about 10 steps between the burn rates of H-110 and Accurate 1680. Why can't I develop a load with ANY of the powders in that range? I have seen some posts that indicate a powder as slow as Reloader 7 can be used.

    Please tell me if this makes sense and where I may be going wrong.

  2. #2
    Boolit Master
    Jupiter7's Avatar
    Join Date
    Mar 2013
    Dyer, TN
    I've used lil gun, h110 & 1680. All work fine. Seen reports of 5744, 2400 and rl7 all being used successfully in an AR. In my bolt gun, unique works quite well.
    I support your right to keep and arm bears.

  3. #3
    Boolit Master bikerbeans's Avatar
    Join Date
    Feb 2013
    there is data for I4227 and I4198 and subsonic bullets on the Hodgdon site. The data is for jacketed bullets. I have only used H110 with cast lead in my AR platform 300 BO.


  4. #4
    Boolit Master Liberty'sSon's Avatar
    Join Date
    Feb 2013
    American by birth, Southern by the Grace of God
    +1 for Lil Gun.

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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