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Rifle Ammo

.300 AAC Blackout Ammo

In stock from $0.65 / round · 4 of 13 products available now

Supersonic it behaves like a short .30-30; subsonic and suppressed it is extraordinarily quiet. Same lower, same magazines, different barrel.

In stock today

Cost per round
$0.65 to $2.05
3 Brands
Barnes, Hornady, IKONICK
Bullet weights
110, 147, 208, 220 grain
Pack sizes
20, 200, 250 rounds
Learn more about .300 AAC Blackout

At a glance

Also known as
.300 BLK, 300 AAC Blackout, 7.62x35mm
Common bullet weights
110-125 grain supersonic, 190-220 grain subsonic
Typical use
Suppressed short-barrel carbines, hog hunting, home defense
Before you buy
A .300 BLK round will chamber in a 5.56 barrel and wreck the rifle. Never share magazines or ammo cans
Age to purchase
21+ (the federal licensed-dealer minimum for ammunition suitable for a handgun, applied as TAS policy)

.300 AAC Blackout was designed to give an AR-15 a .30 calibre bullet without changing anything but the barrel (same bolt, same magazines, same lower) and to reach full velocity out of a very short barrel, which is exactly what a suppressed carbine wants. It runs in two distinct modes: supersonic loads in the 110 to 125 grain range that behave like a short-range .30-30, and heavy subsonic loads around 190 to 220 grain that are extraordinarily quiet behind a suppressor. Before any of that, there is one safety fact about this cartridge that every owner must know.

What to know before buyingCommon questions

Before you buy

What to know about .300 AAC Blackout

What people buy it for

  • Suppressed shooting, subsonic and supersonic
  • Short-barrel rifles and AR pistols, where it loses little velocity
  • Hog and short-range deer hunting
  • Home defense with a compact, suppressed carbine

Never let .300 Blackout near a 5.56 rifle

A .300 Blackout cartridge will chamber in a 5.56 barrel (the case is a shortened 5.56 case) and firing it there destroys the rifle and can seriously injure the shooter. This is not theoretical; it happens every year. Keep .300 BLK ammunition in clearly marked containers, never in a range bag alongside loose 5.56, colour-code or label your magazines, and check the barrel marking every time you build or borrow an upper. Treat it with the same discipline you would give a live primer.

Subsonic and supersonic are effectively two cartridges

Supersonic 110 to 125gr loads shoot flat enough for practical work inside 200 to 300 yards and hunt hogs and deer well at short range. Subsonic 190 to 220gr loads travel below the speed of sound so there is no ballistic crack (which is the entire point behind a suppressor), but they drop steeply and have a short useful range. Zeroes differ dramatically between the two. Decide which you are shooting before you buy a case.

Twist rate for heavy subsonics

Heavy .30 calibre subsonic bullets are long and slow, and they need a fast twist to stabilise. 1:8 or 1:7 is the standard for .300 Blackout barrels and handles the whole range. A slower twist may shoot supersonic loads acceptably and keyhole the heavy subsonics. Check the barrel before buying 220gr.

Cycling subsonics takes a little setup

Subsonic ammunition generates less gas, and many rifles will not cycle it reliably without a suppressor's back-pressure, an adjustable gas block or a lighter buffer. If your rifle short-strokes on 220gr unsuppressed, that is normal rather than a defect. Buy a box before a case, and test the exact configuration you intend to shoot.

Questions

Common questions

Can I convert my 5.56 AR-15 to .300 Blackout?

Yes, a barrel change is all it takes. The bolt, bolt carrier, magazines and lower receiver all carry over, which is a large part of why the cartridge exists. The essential caveat comes with it: once you own both, .300 Blackout will chamber in a 5.56 barrel and fire catastrophically. Mark your uppers, mark your magazines, keep the ammunition physically separated, and confirm the barrel marking every single time.

Do I need a suppressor to shoot .300 Blackout?

No. Supersonic loads work perfectly well unsuppressed and give you a .30 calibre bullet out of a short AR. But subsonic ammunition unsuppressed is largely pointless: it is quiet-ish, drops steeply, and often will not cycle the rifle without back-pressure. If you are not suppressing, buy supersonic.

What is the practical range of .300 Blackout?

Supersonic loads are usefully accurate and effective out to a few hundred yards, in roughly the same territory as a .30-30. Subsonic loads are much shorter-ranged: the trajectory falls away quickly once the bullet is below the speed of sound, and holdovers get large fast. Neither is a long-range cartridge, and nothing about the design pretends otherwise.

Why is .300 Blackout more expensive than 5.56?

It is made in far smaller volume, uses roughly twice the bullet weight in the subsonic loads, and has no military surplus production behind it. Expect to pay a real premium per round, which is exactly why the cost per round is printed beside every price here rather than buried in the fine print.

How much does .300 AAC Blackout cost per round?

.300 AAC Blackout runs from $0.65 to $2.05 per round in stock right now. Every price on the page carries its cost per round beside it, so the comparison is one glance rather than arithmetic.

Which brands of .300 AAC Blackout do you stock?

Barnes, Hornady and IKONICK are in stock in .300 AAC Blackout today. Stock changes as the feed runs, so the list on the page is the current one.

What bullet weights does .300 AAC Blackout come in?

The .300 AAC Blackout in stock runs 110, 147, 208, 220 grain. Weight changes how the round feels and where it prints more than most shooters expect, so it is worth matching what you already shoot.

Is .300 AAC Blackout in stock?

4 of the 13 .300 AAC Blackout products we list are in stock right now. Out of stock items stay on the page rather than disappearing, so a link you saved still works and you can see what normally sits here.

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