Ammo Specifications
More Information on Magtech .300 Blackout Ammo
Magtech Tactical .300 Blackout 123 Grain FMJ (300BLKB) is a supersonic centerfire rifle load designed primarily for training, target shooting, and general range use. Part of Magtech’s Tactical Rifle line, it combines a 123-grain Full Metal Jacket projectile with the compact and versatile .300 AAC Blackout cartridge. Magtech describes its Tactical ammunition as being manufactured to demanding standards with an emphasis on consistent velocity and reliable operation across a variety of firearms. The 300BLKB load is packaged in a 50-round box, providing more ammunition per package than the 20-round format commonly encountered with centerfire rifle ammunition.
The cartridge uses a 123-grain FMJ bullet, consisting of a lead core surrounded by a metal jacket. Unlike expanding soft-point or hollow-point hunting bullets, the FMJ projectile is not specifically designed to expand upon impact. Its construction and streamlined profile instead make this load primarily appropriate for recreational shooting and training. The 123-grain weight also places it firmly within the lighter, supersonic side of the .300 Blackout spectrum, in contrast with the much heavier 190- to 220-grain bullets commonly used in subsonic ammunition.
For the exact 300BLKB SKU, Magtech publishes a muzzle velocity of 2,230 feet per second (680 m/s) from a 16-inch test barrel. Published muzzle energy is 1,359 foot-pounds (1,843 joules), while the projectile carries a G1 ballistic coefficient of 0.330. These specifications are taken directly from Magtech’s current catalog for the 123-grain FMJ load rather than from a similar .300 Blackout cartridge.
Magtech’s ballistic information also illustrates how the projectile performs farther downrange. At 100 meters, the bullet is listed at approximately 600 m/s (1,969 fps) with 1,436 joules (1,059 ft-lbs) of retained energy. At 200 meters, it travels approximately 526 m/s (1,726 fps), while at 300 meters it is approximately 460 m/s (1,509 fps). Actual results will naturally vary according to barrel length, firearm, environmental conditions, and ammunition lot.
The .300 AAC Blackout cartridge was developed to provide .30-caliber performance from the AR-15 platform while maintaining compatibility with standard AR-15 bolts and magazines, with an appropriate .300 Blackout barrel. One of the caliber’s defining characteristics is its ability to accommodate both lightweight supersonic ammunition and heavy subsonic loads. The 123-grain 300BLKB represents the supersonic side of that versatility and produces a ballistic profile quite different from Magtech’s heavier subsonic offerings.
Magtech lists this ammunition as using brass cartridge cases and a small rifle primer. The brass cases are reloadable after appropriate inspection, which can be useful for shooters who retain their fired cases. The manufacturer’s published specifications also confirm 50 cartridges per package.
Overall, Magtech 300BLKB is a straightforward supersonic .300 Blackout range load built around a 123-grain FMJ projectile, 2,230-fps muzzle velocity, 1,359 ft-lbs of muzzle energy, 0.330 G1 ballistic coefficient, brass case, and 50-round packaging. Its conventional FMJ construction and factory-rated supersonic performance make it particularly oriented toward training, target shooting, and recreational use with firearms chambered in .300 AAC Blackout.
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