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Bulk .300 AAC Blackout Ammo

300 Blackout Ammo Common Uses & History

The AR-15 platform can be adapted to fire a variety of calibers other than the original .223/5.56. One of the most widespread of these alternatives is the .300 AAC Blackout, also known as the 300 BLK and the 7.62x35mm. .300 AAC Blackout ammo is an excellent close range performer and one of the best calibers to use with a suppressor. It is named for its developer, Advanced Armament Corporation. One significant benefit of this caliber is that it uses the same magazines as the default 5.56 chambering without any loss of capacity. Typically, converting an AR to this caliber requires only a barrel (or more conveniently, an upper reciever assembly) change.

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Subsonic vs. Supersonic 300 BLK Ammo

300 Blackout ammo is divided into subsonic and supersonic categories. Subsonic .300 BLK ammunition fires a heavy bullet weighing about 220 grains at a muzzle velocity of about 1,000 feet per second. These ballistics are superficially similar to those of the .45 ACP; however, the .300 AAC is designed from the ground up as a rifle cartridge and its spitzer profile and much higher sectional density enables much better medium range performance. The subsonic velocity of these loads enables the round to be fired in a suppressed weapon without creating a sonic 'boom' or 'crack' and compromising the suppressor's effectiveness.

Supersonic .300 BLK ammo is more comparable in external ballistics to the Soviet 7.62x39mm while feeding more reliably in AR-15s due to its non-tapered case. Supersonic .300 AAC loads fire a light 90-125 grain bullet at a muzzle velocity of 2,200-2,600 feet per second. Supersonic ammo in this caliber often uses OTM (open tipped match) bullets intended for competitive and precision shooting; these should not be confused with expanding hollow point projectiles.

Shopping Options

Best Bulk Ammo Deals

When it comes to 300 BLK ammo, you're likely going to want to go with an FMJ or FMJ-BT round for range training. If you're shooting competitively or need something ultra-precise, we'd recommend going with something labeled as "Match" ammo. These loads feature tighter tolerances and more precisely engineered components. Not sure what you need? Here's a look at what the serious 300 AAC Blackout shooters here at BulkAmmo.com are buying the most of right now:

Our hottest ammo based on what serious shooters are buying now

  1. 500 Rounds of 300 AAC Blackout Ammo by Magtech First Defense - 123gr FMJ

    500 Rounds of 300 AAC Blackout Ammo by Magtech First Defense - 123gr FMJ

    $289.00
  2. 500 Rounds of .300 AAC Blackout Ammo by Fiocchi - 150gr FMJ

    500 Rounds of .300 AAC Blackout Ammo by Fiocchi - 150gr FMJ

    Regular Price: $299.00

    On Sale: $279.00

  3. 200 Rounds of .300 AAC Blackout Ammo by Remington - 220gr Open Tip Flat Base

    200 Rounds of .300 AAC Blackout Ammo by Remington - 220gr Open Tip Flat Base

    $189.95
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