ATTENTION - DUE TO DEMAND, CURRENT LEAD TIME ON 9MM & .223/5.56 FMJ IS APPROX. 3 DAYS

300 Blackout Subsonic Ammo | Fenix Ammo

300 blackout subsonic ammo is the reason this cartridge exists, and Fenix loads the two ways to run it. The 190 grain FXP Sub-X pairs subsonic speed with an expanding Hornady projectile for work beyond paper, while the 220 grain FMJ is the classic heavyweight for quiet practice volume. Both are loaded in Michigan, priced factory direct, and sitting below with live pricing on their cards.

2 products
.300 Blackout 190gr FXP Subsonic (100 ct.)
.300 Blackout 190gr FXP Subsonic (100 ct.)
$134.00
.300 Blackout 220gr FMJ (Subsonic) (100 ct.)
.300 Blackout 220gr FMJ (Subsonic) (100 ct.)
$108.75

300 Blackout Subsonic Ammo: Two Loads, Two Jobs

The 220 grain FMJ is your quiet trainer: non expanding, economical for its class, and the load to burn through on suppressed range days. The 190 grain FXP Sub-X is the serious one, carrying Hornady's Sub-X expanding projectile for shooters who need their subsonic to do more than punch paper. Most Blackout owners eventually keep both in the cabinet. Both publish their velocities on their product pages, so you can verify the subsonic claim against the numbers before you order.

Getting the Quiet You Paid For

Suppressed Blackout at subsonic speed is about as quiet as centerfire rifle gets, but only if your rifle cycles it. Gas port size, barrel length, and your specific can all vote, so prove function with one 100 count bag before deep stocking. Published velocities are on each product page so you can see exactly where each load sits against the sound barrier. Once your rifle proves a load, buy it in multiples; a setup that runs is worth keeping fed with the exact ammunition that made it run.

Frequently Asked Questions

What is the difference between the 190 and 220 grain subsonics?

The 190 grain FXP Sub-X expands, built for use past the range; the 220 grain FMJ does not, built for economical quiet practice. Same speed class, different missions.

How quiet is subsonic 300 blackout with a suppressor?

Among the quietest centerfire rifle experiences available: no supersonic crack, just action noise and impact. Hearing safe setups are common, though every rifle and can pair differently.

Will my rifle cycle these subsonic loads?

Many Blackout rifles are gassed for it, but short barrels, adjustable blocks, and different cans all change the equation. One test bag answers it for your setup.