Loaded with unique powders optimized for subsonic use, the low flash signature is ideal for both suppressed and unsuppressed performance. Designed to expand at velocities down to 900 fps. Impact velocities of 960 to 1,020 fps into ballistic gelatin, providing 16-18” penetration and 90%+ weight retention. Rounds such as the 6.8 SPC and 6.5 Grendel had similar parts-interchangeability issues but did allow for the use of the standard M4/M16 30-round magazine, albeit with a reduced capacity. In the case of the 7.62×39mm, its relatively severe case angle caused feeding issues unless specially modified AK-47 magazines were used, and even then results were unsatisfactory. Modified bolts were also needed owing to its larger case head diameter. 30 caliber rounds but encountered problems. Colt Firearms and other arms makers had previously chambered AR-pattern rifles and carbines in various. The new cartridge was intended to negate many of the perceived drawbacks inherent to other large caliber cartridges used in the M4. 3300 BLACKOUT AMMO in cooperation with Remington Defense. While 5.56×45mm NATO has enjoyed widespread acceptance in military circles, the nature of the missions encountered by some special operations groups often demand a round that provides better performance than that available in the high-energy, standard velocity rounds, and subsonic performance greater than standard 9×19mm Parabellum (the ubiquitous pistol and submachine gun) round. 
The performance of the 300 Blackout Subsonic load either meets or surpasses the parameters set forth by the FBI Protocol terminal ballistic test.
Because of the combination of the bullet’s flat profile, the long grooves in its gilding metal jacket, and the unique Flex Tip insert within the hollow-point cavity, the bullet is able to expand reliably even when traveling at low velocity. The Sub-X (Subsonic – Expanding) bullet with 190 grains of weight has a core made of lead. The 300 Blackout Ammo Blackout Subsonic Ammunition was developed specifically for accuracy and performance at velocities lower than the speed of sound.
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