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. NEW: Customers can now choose between Lapua 300BLK brass or Jagemann 300BLK brass (Apex headstamp)

    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

    Brass type

    Jagemann 300BLK Brass (Apex headstamp), Lapua 300BLK Brass

    Barrel Twist

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


    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