Magtech
.300 Blackout 200gr FMJ
Subsonic.300 BlackoutSelf-DefenseBig Game
1,017 fps published muzzle velocity, below the speed of sound.
Sound travels at about 1,050 fps on a freezing morning and about 1,150 fps on a hot afternoon.
The maker does not say what barrel this was measured from, so treat it as a guide rather than an exact figure for your gun.
$44.99 · $0.900/rd
At OpticsPlanet · as of 2026-08-27
$50.46
MSRP
Price on file from OpticsPlanet, updated nightly. We may earn a commission · disclosure
- 1,017 fps
- Velocity · published
- 200 gr
- Bullet
- brass
- Case
- 50 rounds
- Box
- $0.900
- Per round
About .300 Blackout
Heavy subsonic bullets (190gr and up) need a fast twist to stabilise. A 1:8 or faster barrel is the usual recommendation; a slow-twist barrel can keyhole them.
Subsonic .300 Blackout often will not cycle a semi-automatic without a suppressor or an adjustable gas block.