Discreet Ballistics Announces 300 AAC Blackout Selous Subsonic Expander, Available for Preorder


Discreet Ballistics is pleased to announce its 300 AAC Blackout Selous Subsonic Expander is available for preorder (late fall 2017 delivery).


Brass: Lapua 300BLK
Bullet: Selous Machined Expander™ 188gr expanding solid copper projectile
Ballistic Coefficient: .404G1
Average Muzzle Velocity: 925-1000FPS
Minimum expansion velocity: 750FPS


The Discreet Ballistics 300 AAC Blackout 188gr Selous Subsonic Hunting/Self Defense load is designed to be the most effective expanding subsonic 300BLK cartridge available. Before initiating the development process for the Selous Machined Expander™ three areas were identified as crucial factors for a successful subsonic expanding projectile: weight retention, accuracy, and expansion. There is currently no other expanding subsonic projectile option with proficiency in all three of these categories. The Selous Machined Expander™ projectile was designed using state-of-the-art ballistics modeling software to maximize stability at subsonic velocities. As part of the development cycle extensive gel testing was performed and the appropriate design modifications were made to maximize terminal performance.

Ballistics gel test results firing a Selous Machined Expander™ from a Honey Badger 1:5 twist 6.75” barrel at 950fps

The Discreet Ballistics Selous Machined Expander™ is loaded with new Lapua® 300BLK brass and the finest commercially available powder and primers. Discreet Ballistics offers a more economical 190gr target load (pictured below) that is ballistically matched to the 188gr expanding load.


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6 Responses to “Discreet Ballistics Announces 300 AAC Blackout Selous Subsonic Expander, Available for Preorder”

  1. mark says:

    Per Hornady ballistic calculator, if launched at 1000fps, it will still be above the 750fps expansion threshold at 750yards.

    Of course, it will have dropped a 1000+ inches at that range, but still pretty cool.

    • BillC says:

      You know what? I didn’t believe you. So so I too put the above data into Ballistic AE and got about 760 yards for the 750fps without adding in atmospheric data. Good luck getting to that distance though, like you said, since it is about -1156 inch drop (-42 MRAD) with 234ft-lbs of energy, and 2.68 second flight time (with a 2.6″ sight height). It would have about a 90 yard 5″ vital zone radius though with 381 ft-lbs of energy at 956 fps.

  2. DavidS says:

    The 750FPS minimum expansion velocity figure used is really only theoretical as stated above. The reason we use it is to give folks an idea of the amount of energy needed to initiate projectile expansion in fluid.

  3. James Reed says:

    When a round peels back like this one ,one needs more fps than it’s saying.when a round peels back like a banana you must have more fps for any kind of BC,the sharpest of bulllit ‘S WON’T do much at that point.iwould rather use a .22wmr.haveing used .300 black 7.62/35 since 2011 having been in US ARMY SF , FOR THE Last 29yrs 11 months in about 3more weeks I’ll be a free man again,No just kidding it will be a sad bittersweet day for me .But when I tell you about the .300ACC you can take it to the shop or bank or were ever you want I was using it in real live ? actions before 99.9% of people even heard of it . MSGT MadDog. Thank you.