Subsonic 308 Ammo

Subsonic .308 ammo is loaded with heavy bullets at reduced velocity to stay below the speed of sound, so that — paired with a suppressor — it delivers remarkably quiet rifle shooting without the supersonic crack. Built around 175- to 200-grain (and heavier) bullets traveling near 1,000–1,050 fps, subsonic .308 is the choice for suppressed rifles, low-disturbance pest control, and quiet practice. It trades range and trajectory for a dramatic reduction in noise. This page covers how it works and its best uses. It’s part of our full .308 ammo selection.

Tatted Tacticals stocks subsonic .308 from Hornady, Federal, and specialty makers — expanding Sub-X and FMJ subsonic loads, in boxes and bulk.

How Subsonic .308 Works

A suppressor quiets muzzle blast, but a supersonic bullet still cracks as it breaks the sound barrier. Subsonic .308 keeps the bullet below that threshold using a heavy 175- to 200-grain-plus bullet at low velocity, so a suppressed rifle runs much quieter. Because the bullet is heavy and slow, it drops quickly and is a short-to-moderate-range proposition, and expanding subsonic bullets like the Hornady Sub-X are designed to open reliably at the lower velocity. Our subsonic .308 guide compares the quietest loads.

Best Uses and Trade-offs

Subsonic .308 is ideal for suppressed rifle shooting where quiet matters most, for low-disturbance pest and predator control near livestock or homes, and for soft-recoiling quiet practice. The trade-offs are significant bullet drop beyond about 100–150 yards and the need to confirm your rifle cycles subsonic loads if it’s a semi-auto (many bolt guns and dedicated subsonic setups run them best). For pistol-caliber quiet shooting, see subsonic 9mm. Standards follow SAAMI specifications.

Buying Subsonic .308

Browse quality options from Hornady and Federal. Federal law sets the minimum age for rifle ammunition at 18; per ATF guidance, confirm federal rules and review our ammunition shipping rules and state restrictions before ordering.

Subsonic .308 Ammo — Frequently Asked Questions

Is there a .308 subsonic round?

Yes. Subsonic .308 is widely produced, using heavy 175- to 200-grain-plus bullets loaded to stay below the speed of sound (around 1,050 fps). Makers including Hornady, Federal, and specialty companies offer both expanding and FMJ subsonic loads designed primarily for suppressed rifle shooting and quiet, low-recoil use.

What is the point of subsonic .308?

Quiet shooting. Paired with a suppressor, subsonic .308 avoids the supersonic crack for dramatically reduced noise, useful for suppressed practice, low-disturbance pest control, and recoil-sensitive shooting. The trade-off is a heavy, slow bullet with steep drop, so it’s a short-to-moderate-range option chosen specifically for its quietness rather than reach.

What is the quietest .308 subsonic ammo?

The quietest results come from heavy subsonic loads fired through a quality suppressor, with specific heavy-bullet subsonic offerings from Hornady (Sub-X) and others designed for the purpose. The exact “quietest” depends on your suppressor and rifle, but genuine subsonic ammo labeled as such, paired with a good can, produces the quietest .308 shooting.

What are the disadvantages of subsonic .308?

The main trade-offs are steep bullet drop beyond roughly 100–150 yards due to the low velocity, potential cycling issues in semi-autos, and higher cost than standard practice ammo. Expanding subsonic bullets must also be designed to open at low velocity. For suppressed and quiet shooting these are acceptable; for range or distance, standard loads are better.

Can you buy subsonic .308 ammo online?

Yes. In most U.S. states you can buy subsonic .308 online and have it shipped to your door. The minimum age for rifle ammunition is 18, and some states and municipalities add restrictions or shipping limits, so confirm your state and local laws before ordering.