300 AAC Blackout 188gr Subsonic Load Hunting / Self Defense



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    The Discreet Ballistics 300 AAC Blackout 188gr Selous Machined Expander is a subsonic hunting and/or self defense load that incorporates a machined copper 30 Cal projectile (the Selous bullet) which expands at subsonic velocities above 750 feet per second. This projectile was designed using state-of-the-art ballistics modeling software to maximize stability at subsonic velocities. Discreet Ballistics gives its customers the option of choosing these loads optimized for either 16″ barrels or 7-11” barrels.

    The Two Load System
    The Discreet Ballistics’ two load system was conceived so that the shooter of subsonic ammunition can practice with a less costly Target load, and hunt or defend with a premium Hunting/Self-defense load. Methodical load development by Discreet Ballistics has created a system which will minimize point of impact shift allowing the shooter greater confidence when it’s time to hunt or defend.

    Note: The Selous projectile feeds best with 300BLK specific feed ramps. M4-style (narrow) feed ramps may need to be polished/widened for optimized feeding of the Selous bullet – Here is a video on how to do that.



    Additional information

    Weight 1 lbs
    Dimensions 5.5 x 2.5 x 1 in
    Barrel Length

    7-11" Barrel Length, 16" Barrel Length


    20 Round Sleeve

    Barrel Twist

    1/5, 1/6, 1/7, 1/8

    Bolt Gun?

    Y, N


    Brass: New Lapua 300BLK or New Jagemann 300BLK (Apex Headstamp)

    Bullet: 188gr Selous Machined Expander – Solid copper projectile

    Bullet Ballistic Coefficient: .404G1

    Muzzle Velocity Range: 975-1050 FPS – 16″ AR; 875-975 FPS 7″ AR 

    Ballistics Table


    Range Drop Drop Velocity Energy
    (yd) (in) (MOA) (ft/s) (ft•lbs)
    0 -1.5 *** 1066.8 480.0
    25 1.9 7.1 1053.8 468.4
    50 3.3 6.2 1041.4 457.5
    75 2.7 3.4 1029.7 447.2
    100 -0.0 -0.0 1018.5 437.6
    125 -4.7 -3.6 1007.9 428.5
    150 -11.6 -7.4 997.6 419.8

    The Sub Life

    1. Why The Two Different Loads For 300BLK? (8/23/2017) - A fair amount of you have asked me about the reasoning for Discreet Ballistics having two different loads for 300 Blackout. We make a Pistol/SBR load which is optimized for barrels between 7-11” and a Carbine load which is optimized for 16” barrels. The reasons we offer these two different ... | Read More