The Sellier & Bellot Subsonic .300 AAC Blackout 200gr Full Metal Jacket Ammunition, 20-Round Box (part no. SB300BLKSUBA) is built by Sellier & Bellot for suppressed rifle use. Sellier & Bellot’s Subsonic line is loaded specifically to stay below the speed of sound, keeping a suppressed .300 AAC Blackout rifle as quiet as the platform allows. Find it alongside our rifle ammunition selection for shooters who want confirmed specs, not distributor guesswork.

Key Specifications

• The chambering is .300 AAC Blackout, matching guns built for suppressed rifle use.
• The bullet weighs 200 grains, setting the load’s balance of velocity and terminal performance.
• The bullet type is Full Metal Jacket, defining how it performs on impact.
• The case is Brass, resisting corrosion for reliable feeding.
• Each box holds 20 rounds, enough for a serious range session.
• The heavier 200-grain bullet is the weight class needed to stay subsonic in .300 Blackout, unlike lighter supersonic loads.
• The full metal jacket bullet is built for reliable function through semi-auto .300 Blackout platforms.
• The box ships at roughly 0.9 lb, confirmed factory packaging weight for this quantity.
• Cost works out to about $0.81 per round, keeping practice sessions affordable.

Frequently Asked Questions

Is this load subsonic? Yes, the 200-grain full metal jacket bullet is loaded specifically to stay below the speed of sound for quiet, suppressed shooting.

Will this cycle a semi-auto AR platform? The full metal jacket bullet and standard-pressure loading are built for reliable function in semi-auto .300 Blackout rifles.

Buy the Sellier & Bellot Subsonic .300 AAC Blackout 200gr Full Metal Jacket Ammunition, 20-Round Box

Loaded to stay quiet behind a can, it is the round for shooters who want their suppressed .300 Blackout to run as intended. Ships fast from a Lubbock, TX gun shop.