300 AAC Blackout – 123 gr FMJ – Magtech (300BLKB) – 1000 Rounds

Supersonic 300 Blackout range ammo is hard to find at a good price by the case, and Magtech’s 300BLKB fills that gap. This listing is Magtech 300 AAC Blackout 123 grain full metal jacket ammo, MPN 300BLKB, sold as a 1,000 round case packed 50 rounds to the box.

The 123 grain FMJ bullet is a light supersonic weight for the 300 Blackout. Magtech rates this load at 2,230 fps with 1,359 ft-lbs of muzzle energy, similar to 7.62×39 performance from an AR-15 platform. It produces enough gas to cycle most direct impingement and piston 300 Blackout rifles and pistols, both suppressed and unsuppressed. A full metal jacket bullet does not expand, so this is practice, plinking, and training ammunition rather than a hunting or self defense load.

This ammunition fits firearms chambered in 300 AAC Blackout, also listed as 300 BLK or 7.62x35mm. That includes AR-15 rifles and pistols with 300 Blackout barrels, the Sig MCX and MPX-based 300 BLK models, the Ruger American Ranch, CZ Bren 2 in 300 BLK, and bolt and single shot rifles chambered for it. A common question is whether 300 Blackout can be fired in a 5.56 rifle. Never. The 300 Blackout round can chamber in a 5.56 or 223 rifle and cause a catastrophic failure, so mark your magazines and only use this ammo in a firearm marked 300 Blackout. Another common question is whether this load is subsonic. It is not. At 2,230 fps it is supersonic and will produce a sonic crack even with a suppressor.

Magtech 300BLKB is new production ammunition, not reloads, made in Brazil by CBC. Each round uses a brass case with a boxer primer and is non-corrosive, so the brass can be reloaded. This case comes in factory packaging as 20 boxes of 50 rounds for a total of 1,000 rounds of 300 Blackout 123 grain FMJ. Buying by the case keeps you on one production lot so your zero stays put.