300 AAC Blackout 188gr Subsonic Hunting Load



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    The Discreet Ballistics 300 AAC Blackout 188gr Selous Machined Expander is a subsonic hunting 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 and bolt action rifles.

    Utilizes brand new Jagemann Brass with our headstamp (Apex Subsonic)

    Powder charges consistent to within 0.1 grain

    Industry leading seating depth consistency.

    Hunting Loads utilize the Selous Machined Expander 188gr solid copper projectile which expands to over three times its original diameter upon entering fluid

    Effective range is usually within 75-100 yards – Muzzle velocity between 900-1050fps

    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 with a premium load utilizing the Selous Machined Expander. 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.

    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 6.5 × 2.5 × 2 in
    Barrel Length

    7-11" Barrel Length, 16" Barrel Length


    20 Round Sleeve

    Barrel Twist

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

    Bolt or Breech Action?

    Y, N