Sponsored.300 Blackout Ammo Deals
Updated October 18, 2026
.300 Blackout ammo deals split in half, and the halves are not substitutes. Supersonic loads are the range and hunting side: lighter bullets, higher speed, usually cheaper per round. Subsonic loads are the heavy, slower rounds people buy for a suppressed gun. A cheap supersonic case is not a deal on subsonic ammunition, and a subsonic box is a painful way to practice if you did not mean to buy it.
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HORNADY 300 Blackout 208Gr FMJ Subsonic Frontier Ammo 20rd
$15.99
$25.99
38% off
$0.80 / round
.300 BLK
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Read the grain weight. Subsonic .300 Blackout is commonly a heavy bullet. Supersonic is lighter. If the title does not say which, do not guess. The same warning applies to the gun. A .300 Blackout cartridge must not be fired in a 5.56 rifle. They can look similar in a hurry. Buy the caliber printed on the box that matches the barrel stamp.
How to compare a listing
Match supersonic with supersonic, or subsonic with subsonic. Then match brass or steel, then the round count. Price per round only helps after that. 5.56 and .223 deals are the other AR caliber. 8.6 Blackout is a different cartridge that borrows the Blackout name and is not this one.
Live prices are on ammo. The method is in ammo deals and prices.
Questions people ask
Are supersonic and subsonic .300 Blackout the same deal?
No. Supersonic is the lighter, faster load. Subsonic is the heavy load people buy for a suppressed gun. Compare like with like.
Can I use .300 Blackout in a 5.56 rifle?
No. The cartridges are not interchangeable. Buy the caliber stamped on the barrel.