Ammo Specifications
More Information on Sellier & Bellot .300 Blackout
Sellier & Bellot .300 AAC Blackout Subsonic 200 Grain Full Metal Jacket (SB300BLKSUBA) is a premium training and range cartridge engineered specifically for shooters who demand reliable subsonic performance. Developed to take full advantage of the .300 Blackout platform, this load combines a heavy 200-grain Full Metal Jacket (FMJ) projectile with carefully balanced propellant charges to produce consistent subsonic velocities. The result is smooth, dependable performance that makes it an excellent choice for target shooting, recreational range sessions, and firearms optimized for suppressed use where subsonic ammunition is commonly preferred.
At the core of this cartridge is a 200-grain Full Metal Jacket bullet featuring a traditional lead core enclosed in a CuZn 10 copper-zinc alloy jacket. The FMJ design minimizes barrel fouling while promoting reliable feeding in a wide variety of semi-automatic and bolt-action rifles chambered in .300 AAC Blackout. Because the bullet is non-expanding, it is intended primarily for training, target practice, and general recreational shooting, offering consistent accuracy and dependable performance over extended shooting sessions.
Sellier & Bellot loads the SB300BLKSUBA to a published muzzle velocity of 1,060 feet per second from a 16¼-inch test barrel. This carefully tuned velocity keeps the projectile below the speed of sound under normal atmospheric conditions, eliminating the supersonic crack associated with standard rifle ammunition. The cartridge generates approximately 499 foot-pounds of muzzle energy, while the heavy bullet maintains momentum effectively as it travels downrange. According to Sellier & Bellot’s published ballistic data, velocity remains approximately 1,013 fps at 100 yards and 944 fps at 300 yards, demonstrating the efficient performance of its heavy-for-caliber projectile.
A standout feature of this load is its impressive G1 ballistic coefficient of 0.558 (G7: 0.242). The high ballistic coefficient allows the bullet to retain velocity efficiently and resist wind drift better than many lighter .300 Blackout projectiles, contributing to consistent performance at extended distances despite its subsonic velocity. Combined with a sectional density of 0.301, the heavy 200-grain bullet delivers stable flight characteristics that many shooters appreciate for precision target work.
Every cartridge is assembled using reloadable brass cases, non-corrosive Boxer primers, and carefully metered propellant charges that reflect Sellier & Bellot’s long-standing commitment to quality manufacturing. Strict quality-control standards help ensure consistent ignition, reliable cycling in appropriately configured firearms, and uniform velocities from lot to lot. The ammunition is packaged in 20-round boxes, making it convenient for range trips while remaining easy to store alongside other .300 Blackout loads.
For shooters seeking dependable subsonic ammunition, the Sellier & Bellot 200 Grain FMJ has become a popular option thanks to its consistent accuracy, reliable functioning, and excellent value. Whether you’re spending an afternoon at the range, refining marksmanship skills, or enjoying the unique characteristics of the .300 Blackout platform with subsonic ammunition, SB300BLKSUBA offers the quality, consistency, and performance that have made Sellier & Bellot one of the world’s most respected ammunition manufacturers.
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