Discreet Ballistics – Precision Machined Projectiles

Even though shooting quietly is a passion of mine, I have yet to break into the world of suppressed 300BLK. I’m also not ashamed to admit that I had to review the definition of ballistic coefficient (BC) before writing this post. What I learned in my limited research is that there are companies who are working to push the boundaries of precision subsonic shooting. One of these companies, Discreet Ballistics, is a New Hampshire-based manufacturer specializing in the design, development and production of subsonic rifle ammunition and accessories.

“When Discreet Ballistics started started in 2015 we had every intention of choosing a bullet from one of the known bullet manufacturers to incorporate into our expanding subsonic 300 Blackout,” said owner David Stark.

However, after testing every expanding 30 caliber subsonic bullets available on the market the company found some serious deficiencies. When testing and evaluating they focused their analysis on three areas: accuracy; bullet action (expansion); and projectile mass retention upon terminal impact. What became clear during their tests was that the best subsonic projectiles on the market only excelled in one or two of these areas.

Rather than choosing from what was available, Discreet Ballistics decided to develop a 30 Caliber subsonic expanding projectile that excelled in all of their requirements. Last year, Discreet Ballistics partnered with Peregrine Bullets to develop and manufacture an entirely new monolithic copper subsonic expanding projectile.

Peregrine Bullets usee Swiss-type lathes to manufacture and prototype commercial target, hunting, and self-defense projectiles. In order to analyze bullet flight characteristics, Peregrine uses OpenFoam software which makes it possible to customize their Computational Fluid Dynamic (CFD) analysis. Long story short, technology allows the company to visualize drag and other forces at work on Projectiles at different velocities.

A black and white simulation image are the prototype bullet travelling at 1000FPS.

Discreet Ballisticss

A color simulation image are the prototype bullet travelling at 750 FPS. Red areas are drag.

The most recent version of the projectile loaded as 300 AAC Blackout Subsonic.

Bullets expanded after being pulled from ballistics gel.

The new projectile is known internally at Discreet Ballistics as the Selous bullet and it will be available as premium loaded ammunition in mid-to-late Spring 2017. The projectile weight is 188 Grains. The cartridges are available for pre-order now at www.discreetballistics.com.

Currently available for purchase at www.discreetballistics.com are 50 round boxes of 190 grain 300 blackout subsonic cartridges that are ballistically matched to the Selous cartridge in 300 blackout subsonic. We’re offering these cartridges so that our customers will be able to practice with less expensive lead core FMJ ammunition.

Discreet Ballistics 300 AAC Blackout

The Discreet Ballistics’ 300 AAC Blackout 190gr Subsonic Target Load is intended for use in semi-automatic and bolt action firearms chambered in 300 Blackout. This round has been thoroughly tested to function in both pistol and carbine length gas systems. Discreet Ballistics gives its customers the option of choosing these loads for use in 16″ barrels or 7-11″ barrels due to significant variability in muzzle velocity depending on barrel length.

Discreet Ballistics designed this target round as part of a premium two load system that complements the Discreet Ballistics 300 AAC Blackout Hunting/SD system which utilizes a machined copper projectile (Selous bullet).


  • Brass: New Jagemann – 300BLK Sub – Factory Annealed
  • Bullet: 190 grain HPBT FMJ
  • Bullet Ballistic Coefficient: .530G1
  • Average Muzzle Velocity at 50 Deg F: 1040 FPS




LE – Science – OSINT.
On a mission to make all of my guns as quiet as possible.
Twitter: @gunboxready
Instagram: @tfb_pete


  • Very cool to see the behind the scenes drag simulation.

  • Dr. Longfellow Buchenrad

    Are bullets that expand that far likely to hold together when they encounter something harder than ballistics gel (like bone)? Those petals look mighty flimsy.

    • ActionPhysicalMan

      I haven’t tested these folks bullets, but structurally they look similar to Maker subsonics. My .338 Maker subsonic petals just bend back further if they clip something hard. Even if they broke off, only a fairly small fraction of the mass is in even all three of the petals. After nicking a bone (simulated bone anyway) the long main body is sent tumbling.

  • Vet for Trump

    I would be interested in the 190 gr. HPBT FMJ *IF* I could buy just the projectile, not loaded ammunition. I custom handload for my 300BLK AR.
    My present subsonic load is Hornady ELD Match 208gr. G1 BC .670 loaded with 8.5gr. H110 OAL 2.250″ Average 1094 FPS. Maybe 1 out 10 will just barely go supersonic depending on the temperature.

    • ActionPhysicalMan

      I agree. As a hand loading addict I am not interested in loaded ammunition. I want ammunition tuned for my rifle.

      • Vet for Trump

        I emailed them and David answered back:
        “At this time we are only selling the cartridges. This may change based on demand later.”

  • nova3930

    If they actually got CFD to model drag accurately I’ll be impressed…

    • MzUnGu

      Colorful Fluid Dynamic, it is.

  • Stuki Moi

    I just want a .30cal Hornady ftx “Critical Duty” handgun round with a shank extended to make it 200 grains….. Or, something else similarly sane cost and standardization wise.

    Even more so with “precision instruments” like rifles than with handguns, availability of cheap (or at least cheapish and available) training ammo that almost exactly match service rounds, is of greater importance than minute advantages of ultra sophisticated bullets. SEAL snipers charged with head shooting Somali hostage takers from a boat in 10 foot seas, may be able to justify blowing through cases of ultra sophisticated copper bullets in training, but most people simply can’t.

    I guess I’m just grumpy and need to brighten up, but I’ve been going though some loadings of Lehigh’s presumably excellent “penetrator” bullets for bear revolvers, and they virtually never shoot to same point of aim as anything obtainable for less than $1.50 a round…….. Heck, even in auto pistols, they manage to be a bit off, no doubt due to copper being less dense than lead, and the bullets being of unusual weights.

    • Hoplopfheil

      I started buying Winchester White Box JHP ammo instead of fancy stuff after a very convincing series of videos about “Hyper Ammo” by Paul Harrell on YouTube.

      Also, the SIG Sauer branded ammo, which in my locale is crazy cheap.

      • pablo4twenty

        I watched it. Good info.

    • ActionPhysicalMan

      Aren’t the Lehigh “FTM”s all less than $1.50? Even the .50 is $1.12 per bullet.

  • The shape of the projectile is all wrong for subsonic flight: Snub nose, long body and a long tapered boat-tail is what is needed like the 9×39mm. https://uploads.disquscdn.com/images/e0636e7426e48d7072733a79d34b248928126f06b754c2874f94c99c0aa6a9e0.jpg

    • noob

      that would be ideal, but it looks like they want an expanding cavity, and those squishy tips are already patented by Hornady, so they got creative by cutting grooves in the projectile to manipulate vortex generation and create a virtual boat tail by having the vorticies come together behind the bullet.

  • noob

    can they do one that works underwater like those russian projectiles that fly (swim?) accurately when fired by divers

  • noob

    industrial computer controlled ammo loading machines are pretty nifty and oddly satisfying to watch.

  • jestertoo

    I think the colored CFD picture shows pressure, not drag. Red on the front is drag. Blue on the back is drag.

  • uisconfruzed

    I do have a suppressed 300BLK SBR, I won’t hunt with subsonics 🙁
    I bought a SilencerCo Hybrid for .460 projectiles and wish SOMEONE made a 16″ 458 SOCOM 1/14″ twist bolt/lever gun-(Hello Ruger American with AI mags)