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Mystery Maker Claims to Develop 900-Meter 300 Blackout Round

No, you’re not reading that headline incorrectly. Trom Munitions, an unknown cartridge developer once called PNW Arms and Valiant Firearms, claims to have made a 300 Blackout cartridge capable of reliably hitting out to 900 meters. If you’ve been a loyal reader, you saw our article headlining the max effective range of 300 Blackout to be somewhere around 400-meter mark. What gives?

Trom Munitions goes so far as to claim their magical uniform 300 BLK round has a 100% chance of hitting an official IDPA Silhouette-sized target at this distance, while maintaining over 400 joules of energy. We took issue with some of these claims, but the company as released a very official-looking .PDF, complete with fancy designs and charts, seemingly backing up these wild claims.

Supersonic 300 BLK Going to Insane Distances?

If we take a look at their ballistic chart…

Trom Munitions 300 BLK Ballistic Chart

We find some things that, if actually somehow true, are very exciting. For one, this mythical “Flight Supersonic 300 BLK” round supposedly retains a velocity of 1,134 feet per second – that’s supersonic – out to 700 meters, or 766 yards. Without getting into the thick of it, supersonic flight dramatically improves a shooter’s hit probability, and the goal of any rifle round is to retain supersonic flight as long as possible, so this is a big leap for the 300 Blackout community if true.

It gets better.

Subsonic Reaching 600 Yards?

The big argument against 300 Blackout is its performance in a subsonic configuration. Most agree that the round provides little power and accuracy beyond 200 meters – but Trom claims to have fixed this issue. They’re claiming they’ve developed a subsonic 300 BLK round that reaches 600 Yards that packs a whopping 553 pound-feet of energy at the ringer.

Trom 300 BLK Subsonic Ballistics

The company claims to manage this performance by using a cartridge that loses very little velocity across a great distance. For example, their subsonic ballistic data claims the starting velocity (at the muzzle) of their unicorn round is 1,060 feet per second. They claim that by 600 yards, the round is still traveling around 919 feet per second. That’s a velocity retention of almost 87% across more than one-third of a mile.

That’s almost simply unbelievable. Too good to be true, we think. Is it? Right now, we can’t be positive. Conducting an organic search for “Trom Munitions” returns literally zero results. “Trom Technologies, LLC” is the parent brand of the company, though even this search term returns trademark application results and nothing more.

Legit or Blowing Smoke?

A little investigative journalism reveals that Trom Technologies, LLC is (or at least, was) a relatively new but very real specialty ammunition maker, known as PNW Arms, which was itself known as Valiant Firearms and Ammunition. NPR did a piece on the newcomer firm, located in gun-friendly Idaho. Co-owner Kayla Cuellar explained in a 2012 editorial how every cartridge is assembled by hand and tested for accuracy on home-built ranges on local BLM territory.

What’s concerning is the sudden and unexplained disappearance of Valiant Firearms and PNW Arms. Social media profiles under the “Valiant Firearms” handle were posting activity as recently as November 3rd, though the company website is mysteriously unavailable.

Perhaps the company is in transition to this new and exciting Trom Technologies brand. Maybe the whole thing is a ruse. All we know is that if these magic 900-meter supersonic and 600-yard subsonic 300 Blackout cartridges do come to fruition, we’ll be putting them to test and pushing the limits of our own uppers.


DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 300-blackoutupper, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.


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