450 Bushmaster Subsonic Load Data

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  • Edgedweapon88

    Junior Member
    MDS Supporter
    Oct 28, 2009
    7
    St. Mary's County, MD
    I have been unsuccessful at finding any load data in the forums or in my current load books about subsonic loads for the 450 bushmaster. Specifically, a 395 grain sub-x projectile from Hornady.

    Based on the factory sub-x round I took apart it looks like roughly 19-20 grains of mystery powder. H110, Vhint 110, lil gun and Accurate #9 all seem to be a possibility.

    Anyone have experience loading subsonics for this T-Rex cartridge?
     

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    85MikeTPI

    Active Member
    Jul 19, 2014
    2,203
    Ceciltucky
    Ammo Factories don't have to use factory powders.

    If I was going to make 395gr subs for my big board AR, I would start at 19-20gr of Accurate 1680 and work down a ladder with a good Chrono and checking for squibs along the way.
     

    Harrys

    Short Round
    Jul 12, 2014
    2,006
    SOMD
    I have been unsuccessful at finding any load data in the forums or in my current load books about subsonic loads for the 450 bushmaster. Specifically, a 395 grain sub-x projectile from Hornady.

    Based on the factory sub-x round I took apart it looks like roughly 19-20 grains of mystery powder. H110, Vhint 110, lil gun and Accurate #9 all seem to be a possibility.

    Anyone have experience loading subsonics for this T-Rex cartridge?


    Based on the recomendations of all the above 325 gr heads are the maximum size to be used safely.
     
    Last edited:

    Edgedweapon88

    Junior Member
    MDS Supporter
    Oct 28, 2009
    7
    St. Mary's County, MD

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    RAW TOW

    Junior Member
    Aug 22, 2022
    1
    Broken Arrow
    Talked to a Hornady rep from the factory about reloading the 395gr sub-x bullets, and they are blending powders to get the below the speed of sound performance. They explained that they are working on getting data for the public to load the bullets which they have sold on the market all year long. Don't hold your breath fellas.
     

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