The Cheapest .300 Blackout Ammo In Stock Right Now
Ranked from our live inventory and today’s prices. Updated as stock and pricing change.
.300 Blackout is the caliber people buy twice: once for the rifle, and again when they realise how different subsonic and supersonic are. This page ranks every in-stock .300 AAC Blackout load by what it actually costs per round, supersonic and subsonic kept apart, so you are comparing the ammo you will actually shoot. Everything below is on our shelf in Idalou, Texas, and ships to your door. Outside Texas there is no sales tax.
LIVE RANKINGS
Today’s Cheapest .300 Blackout, by Cost per Round
Rankings recalculated from live inventory · last refresh Nov 9, 3:37 pm
Cost per round, not box price, is the only honest comparison: a 50-round box at $42 beats a 20-round box at $22 and it is not close. The table re-sorts itself as prices move, so the top row is the current answer, not the answer from the week this page was written.
SUBSONIC OR SUPERSONIC
Subsonic or Supersonic? Pick Before You Buy
This is the one decision that matters in .300 Blackout, and buying the wrong one is the most common mistake we see.
Supersonic is the light stuff, 110 to 150 grains, leaving a 16-inch barrel around 2,200 feet per second. It shoots flat to a couple of hundred yards and hits like a short-barrelled .30-30. It is what you want for hunting, for steel, and for general range work. It is also the cheaper half, though not by much right now: the cheapest supersonic full metal jacket here is 81¢ a round.
Subsonic is the heavy stuff, 190 to 220 grains, loaded down to roughly 1,000 feet per second so it never breaks the sound barrier. That matters for exactly one reason: a supersonic bullet makes a crack downrange that no suppressor can silence. Put a can on a rifle shooting subsonic .300 Blackout and it is genuinely, remarkably quiet. That is the whole reason the caliber exists. Subsonic starts at 85¢ a round here in a 50-round box.
What most people end up doing: supersonic for practice because it is cheaper, subsonic for anything suppressed. Buy a box of each before you commit to a case of either.
One thing to check on your rifle. Subsonic ammo makes less gas, and some rifles will not cycle it reliably without a suppressor attached or an adjustable gas block. If yours short-strokes on subsonic, that is the cause, and it is a fixable one. Bring it by the shop and we will set the gas for you.
HOW THIS LIST WORKS
Real Math, Live Inventory
These rankings come from the same stock system the shop runs on. If a load is listed here, it is on the shelf; when it sells out it leaves the table. Nothing on this page is a price we wish we had, or one from a national site that will be out of stock when you click through.
BY THE CASE
Bulk .300 Blackout: Cases and 50-Round Boxes in Stock
.300 Blackout does not come by the case as often as 9mm or .223, so the savings live in 50-round boxes rather than 1,000-round cases. That is where the cheapest cost per round in this caliber sits, both supersonic and subsonic. We also stock full cases when the distributor has them; the table above shows them alongside the boxes, ranked on the same cost-per-round number, so you never have to do the arithmetic yourself.
SUPPRESSED
Running It Suppressed
Subsonic .300 Blackout and a suppressor are a package. One without the other is half the point of the caliber: a can on supersonic ammo still cracks, and subsonic ammo without a can is just slow.
If you do not own a suppressor yet, the process is faster than its reputation. The federal tax has been $0 since January 2026, and approvals on most individual filings are coming back in a few days rather than months. We file the paperwork here.
LUBBOCK & WEST TEXAS
Buying .300 Blackout Near Lubbock
We are in Idalou, fifteen minutes east of Lubbock, and the ammo on this page is in the building. Order it for pickup and skip the shipping, or have it sent to your door anywhere in the country. If you are working up a load for a short-barrelled rifle or a hog gun and want a second opinion on the bullet weight, call or text (806) 559-8228.
FAQ
Cheap .300 Blackout Ammo FAQs
What does .300 Blackout cost per round right now?
Look at the top row of the table above. It is recalculated from our live inventory, so that number is today’s answer. For a general sense: supersonic full metal jacket sits at the low end, around 81¢ a round at the moment, and subsonic match and hunting loads run toward the top.
Is subsonic .300 Blackout more expensive than supersonic?
A little, and less than people expect. The cheapest subsonic here is a 200-grain full metal jacket at about 85¢ a round in a 50-round box, against 81¢ for the cheapest supersonic. If you are shooting suppressed, that difference is the price of the whole point of the caliber.
Will .300 Blackout fit in my 5.56 AR?
Almost. The magazines and the bolt carry over, so converting a 5.56 AR to .300 Blackout is a barrel swap and nothing else. That is the reason the caliber took off: one lower, two very different rifles. Keep the two calibers in marked boxes so you always know which ammo is going with which upper.
What barrel length do I need?
.300 Blackout burns its powder fast and was designed around short barrels. It reaches nearly full velocity from about 9 inches, which is why it is the default choice for short-barrelled rifles and pistol-length ARs. A 16-inch barrel works fine and gains you very little over a 10-inch one.
What grain should I buy for hogs?
Supersonic, 110 to 150 grains, with an expanding bullet rather than full metal jacket. At normal West Texas ranges that combination does the job, and it is flat enough that you are not holding over. Subsonic will work at close range with the right bullet, but it is a specialist choice. Text us what you are hunting and we will tell you what we would run.
STOCK UP
Browse All Rifle Ammo
Questions about any of it? Call or text (806) 559-8228. Everything on this page is in stock in Idalou, ships to your door, and carries no sales tax outside Texas.