Hornady: 300 Blackout 190gr Sub-X, 20/Box

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Hornady® Subsonic Ammunition — designed for accuracy and performance below the speed of sound — now comes in both rifle and handgun loads.

Subsonic Handgun utilizes tried-and-true XTP® bullets that expand reliably at subsonic velocities. The Sub-X bullet used in Subsonic Rifle features a lead core. Long grooves in its gilding metal jacket combine with the bullet’s flat profile and the patented Flex Tip® insert within its hollowpoint cavity to help it expand reliably at low velocities.

Powders are selected for optimal performance and consistency from lot to lot.



Proven Performance

Performance of 300 Blackout Subsonic meets or exceeds FBI Protocol terminal ballistic test requirements. The XTP® bullet in Subsonic Handgun has built a world-class reputation for accuracy and stopping power.

Silent and Stealthy

Hornady® Subsonic Ammunition doesn’t have the loud report of a supersonic round, and paired with a suppressor, it’s even quieter. Unique powders optimized for subsonic use result in a low flash signature, ideal for either suppressed or unsuppressed performance.

High Quality Components

With high-quality cartridge cases and primers, Subsonic Ammunition offers the performance and accuracy shooters have come to expect from Hornady.




Technical Information

Caliber: 300 Blackout

Bullet Weight: 190 Grains

Bullet Style: Sub-X

Case Type: Brass


Ballistics Information

Muzzle Velocity: 1050 fps

Muzzle Energy: 465 ft lb

Ballistic Coefficient: .437 G1

Sectional Density: .286



Ammunition Restrictions by State

No Shipping to HI or AK 

This item is restricted in certain states. Please make sure you are familiar will all laws in your area. Ammunition Restrictions.




.300 Blackout


  • 5
    Subs 190 gr

    Posted by Carl T Stilwell on Jul 22nd 2022

    Excellent match to my rifle barrel.

  • 5
    300 BLK Ammo

    Posted by Andrew Tee on Sep 10th 2021

    Love this hard to get ammo, and MHS came through and with a very reasonable price. I need more now LOL