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The Atomic 88431 is a 300 AAC Blackout subsonic load topped with a 220-grain Sierra MatchKing hollow point boat tail, the same bullet a lot of precision folks trust when they want tight groups. It leaves the muzzle right around 1,050 feet per second, which keeps it comfortably below the speed of sound so you skip the sharp sonic crack that gives supersonic rounds away. That heavier bullet carries roughly 538 foot-pounds of muzzle energy, putting it in the same neighborhood as many .45 ACP service loads, all while keeping recoil and noise mild.
Atomic builds this one with quality components across the board: new reloadable brass, flash-suppressed powder, and Sierra's world-famous MatchKing projectile. The boat tail helps with downrange stability and the hollow point aids energy transfer on impact. It's designed to deliver excellent accuracy past 100 yards out of barrels with a 1:8 twist or faster, and plenty of owners report tight, repeatable groups when their rifle is set up for it.
Subsonic 300 Blackout is the reason a lot of people bought into this cartridge in the first place, and this load fits that role well. Paired with a can, it runs quiet with minimal muzzle flash and reduced first-round pop. Keep in mind that subsonic ammo doesn't always generate enough gas to cycle every semi-auto on the planet, so if you're shooting an AR you'll want a setup tuned for it. Bolt guns eat it up no problem.
Where this round really earns its keep is inside about 150 yards. It's a natural for suppressed range time, low-recoil practice, close-range hog and varmint work, and quiet property use where a full-power rifle load would be overkill. New brass means you can hang onto your cases and reload them down the road too, which is a nice bonus for anyone who likes to roll their own.
Yes. It leaves the muzzle at around 1,050 feet per second, which stays under the roughly 1,125 fps sound barrier at sea level. That means no sharp sonic crack, making it a great match for suppressed rifles where a quiet report is the whole point.
Subsonic loads produce less gas than supersonic rounds, so cycling depends on how your rifle is set up. AR platforms tuned for subsonic use, often running a suppressor or an adjustable gas system, tend to run it well. Bolt-action rifles will handle it without any issue since they don't rely on gas to cycle.
It shines at suppressed range sessions, low-recoil practice, and close-range work on hogs and varmints inside about 150 yards. The 220-grain MatchKing is a precision bullet, so it's also a solid pick if you want tight groups from a properly twisted barrel.
You can. Atomic loads this round in new, reloadable brass with a standard Boxer primer, so once you've shot it you can save the cases and load them again. That's a nice perk for anyone who reloads their own 300 Blackout.
| UPC | 860012884315 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 88431 |
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