HSM Subsonic 8.6 Blackout 300gr HP BT

The HSM Subsonic 8.6 Blackout 300-grain Hollow Point Boat Tail (HSM part no. 86BLK1N) is loaded to stay below the speed of sound, the entire point of running a big, heavy .338-caliber bullet in this newer large-bore cartridge. 8.6 Blackout was designed for suppressed AR-10-pattern rifles and bolt guns that want more downrange authority than 300 Blackout can offer while still staying quiet. The 300-grain boat-tail hollow point keeps trajectory flatter than a flat-base bullet at these velocities and is built to expand reliably even at subsonic speed. It’s a strong pick for suppressor-focused shooters who want a heavier-hitting subsonic round than the 300 Blackout crowd is running.

Key Specifications

• Chambered in 8.6 Blackout, a large-bore cartridge purpose-built for suppressed subsonic shooting in AR-10-pattern rifles and bolt actions.
• The 300-grain bullet is heavy for the .338 bore diameter, which is what lets it stay subsonic while still carrying real downrange energy.
• Bullet construction is hollow point boat tail (HPBT), built to expand on impact and hold a flatter trajectory than a flat-base bullet at subsonic speed.
• This is a Subsonic-specific loading, tuned to run below roughly 1,050 fps, the speed of sound at typical conditions, so a suppressor does its job without a sonic crack.
• It’s packaged 20 rounds to a box, the standard count for this HSM loading.
• 8.6 Blackout was built specifically to give suppressed shooters a bigger, harder-hitting subsonic option than the more common .30-caliber subsonic cartridges.

Frequently Asked Questions

Is this ammunition subsonic? Yes — it’s loaded specifically to stay below the speed of sound, which is the whole point of running a heavy 300-grain bullet in 8.6 Blackout.

Will the HPBT bullet expand at subsonic velocity? Yes — the hollow point boat tail design is built to open up reliably even at the reduced velocities subsonic loads run at.

What’s this cartridge built for? 8.6 Blackout is designed for suppressed AR-10-pattern rifles and bolt actions that want more downrange power than 300 Blackout while still running quiet.

Buy the HSM Subsonic 8.6 Blackout 300gr HPBT

If you’re running a suppressed 8.6 Blackout rifle, a subsonic load built around a real hunting-grade hollow point beats a generic downloaded round. Order it from our HSM lineup at our Lubbock, Texas gun shop and it ships fast to your door, or browse the full rifle ammunition selection for more suppressor-ready loads.