HSM Subsonic Blackout ammunition is a heavy‑bullet, subsonic offering built around a 300‑grain jacketed hollow point for controlled terminal performance at subsonic velocities. It is supplied in standard retail boxes and is marked as reloadable. Documented muzzle velocity and energy are provided by the manufacturer and appear in the specifications below.
Packaging
Box: Sold per box containing 20 cartridges.
Case: Available by the case; one case contains 25 boxes. A case quantity is achieved by ordering the required number of boxes.
Key Specifications
- Manufacturer is HSM.
- Bullet type is Jacketed Hollow Point.
- Bullet weight is 300 grains.
- Cartridges per box are 20.
- Boxes per case are 25.
- Reloadable status is Yes.
- Muzzle velocity is 960 fps.
- Muzzle energy is 735 ft lbs.
- Category is Rifle Ammunition.
HSM Subsonic Blackout JHP ammunition offers a purpose‑built, heavy‑bullet option for shooters seeking subsonic performance in Blackout platforms. Packaged for retail and bulk supply, this load provides consistent documented ballistics and reloadable cases for handloaders.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.




