300 AAC Blackout

300 AAC Blackout — Supersonic & Subsonic Reman Ammo

300 AAC Blackout (300 BLK) was built to do one thing regular 5.56 can't: run subsonic loads reliably through the same AR-15 platform, magazine, and bolt carrier group — especially useful for suppressed shooting — while still offering a full-power supersonic option for everyday range work. Brass Kisses carries both ends of that spectrum, remanufactured in-house.

Our 147gr FMJ supersonic load is the practice round: standard-pressure, reliable cycling, and priced for high-volume range days or 3-Gun practice. Our 220gr FMJ subsonic load is loaded specifically to stay below the sound barrier — the heavier bullet keeps velocity down for quieter shooting behind a suppressor, though subsonic ammo isn't guaranteed to reliably cycle every AR-15-pattern rifle; if you're running subsonic through a semi-auto, make sure your gas system and buffer setup are tuned for it (a pistol-length or adjustable gas system typically helps).

Whether you're new to 300 Blackout or already running it as your go-to suppressed-host caliber, the appeal is the same: one magazine, one bolt carrier group, two very different jobs. Swap between supersonic for the range and subsonic for quiet work without changing anything on the rifle itself — just the ammo in the mag. That flexibility is a big part of why 300 BLK has become a staple for AR-15 shooters who want more than one use out of a single platform.

Both loads go through the same process: cases inspected, resized, and reloaded, then function-tested before they're boxed. We remanufacture every caliber we sell the same way — brass is checked for cracks and case-head separation risk, resized to spec, reloaded with a consistent charge, and function-tested before it ships. If a batch doesn't meet our standard, it doesn't go out the door, whether you're buying a single box or palletizing an order for a training class.

Whether you're stacking up range time or running a suppressed carbine, 300 BLK from Brass Kisses is built to feed reliably and perform consistently, shot after shot — and orders of 250 rounds or more ship free at checkout.

FAQ

Q: What's the difference between the 147gr and 220gr loads?
A: The 147gr FMJ is a supersonic load built for standard range use and high-volume practice. The 220gr FMJ is a subsonic load, loaded specifically to stay below the speed of sound for quieter shooting, especially with a suppressor.

Q: Will subsonic 300 BLK cycle reliably in my AR-15?
A: It depends on your gas system. Subsonic ammo generates less pressure than supersonic loads, so some semi-auto rifles need a gas system or buffer setup tuned for subsonic ammunition to cycle reliably. If you're shooting subsonic through a standard-gas-system AR, test a few rounds before you commit to a full range day.

Q: Do I need a suppressor to shoot subsonic 300 BLK?
A: No — you can shoot subsonic ammo unsuppressed. But the main advantage of subsonic 300 BLK (reduced sound signature) is most noticeable when paired with a suppressor.

Q: Is 300 Blackout reman ammo reliable?
A: Yes. Every case is inspected, resized, reloaded, and function-tested in-house before it ships, whether it's our supersonic or subsonic load.

Q: Do you offer free shipping on bulk 300 BLK orders?
A: Yes — orders of 250 rounds or more ship free at checkout.