Subsonic 308 For Sale

A suppressor only solves half the noise problem. It traps and cools the expanding gas at the muzzle, which is the loudest single event in the firing cycle, but it does nothing about a bullet traveling faster than roughly 1,125 fps. That bullet drags its own sonic boom downrange, and no amount of baffle stack will quiet it. Subsonic 308 exists to remove that second signature entirely, by loading a heavy bullet slow enough to stay under the sound barrier from muzzle to target.

The way you get there in 308 Winchester is mass. Both of the loads on this page run a 200 grain projectile at roughly 1,050 fps, well under the threshold, versus the 2,600 to 2,800 fps a standard 150 or 168 grain 308 load produces. That is a dramatic reduction, and it comes with consequences most buyers do not anticipate until the ammo is already in the safe.

What to know before you buy subsonic 308

• It usually will not cycle a semi-auto. Subsonic loads generate far less port pressure than the gas system on an AR-10 pattern rifle was tuned for. Expect to run an adjustable gas block, a lighter buffer and spring, or to cycle the action by hand. Bolt guns are the natural home for this ammo.
• The trajectory is a rainbow. At 1,050 fps a 200 grain bullet sheds height fast. Practical accuracy work happens inside 100 to 150 yards, and past that you are holding over significantly.
• Stabilization varies by rifle. Heavy bullets at low velocity are harder to stabilize than the same bullet driven fast. Standard 308 twist rates generally handle 200 grain subsonic, but group size differs meaningfully from one barrel to the next.
• These are FMJ loads. A full metal jacket at 1,050 fps does not expand. This is suppressed range and steel ammunition, not hunting ammunition. If you want subsonic terminal performance you need a purpose-built expanding subsonic bullet.
• Both loads are headstamped 7.62x51. They chamber and fire in 308 Winchester rifles, and the military designation on the box is not a compatibility problem.

Buy the 20 round box first and confirm your rifle both stabilizes and, if it is a semi-auto, actually cycles it. Then commit to the 200 round case.

Related 308 and 7.62x51 ammo

• 308 Winchester Ammo - the full catalog of supersonic hunting, match, and range loads
• 7.62x51 Ammo - the NATO-spec side of the same cartridge, where both of these loads live
• M80 Ball Ammo - the 147 grain supersonic military standard, for comparison
• 308 Match Ammo - when precision matters more than sound signature
• Bulk 308 Ammo - for stocking up at the lowest cost per round

Subsonic ammo in other calibers

• 22 LR Subsonic Ammo - the quietest and cheapest way into suppressed shooting
• 9mm Subsonic Ammo - most 147 grain 9mm is subsonic by default
• 45 ACP Subsonic Ammo - a cartridge that was subsonic from birth
• 44 Magnum Subsonic Ammo
• 30-30 Subsonic Ammo
• 45-70 Subsonic Ammo

Suppressor and subsonic guides

• Subsonic vs Supersonic Ammo - the full breakdown of what changes and why
• How Much Does a Suppressor Actually Reduce Noise? - measured decibel data
• Are Silencers Illegal? - where suppressors are legal and what ownership requires
• 300 Blackout vs 308 - 300 BLK was engineered from the start to run subsonic through an AR, and it is the honest comparison here
• Best 308 Subsonic Ammo for Hunting - what to look for when FMJ will not do
• Hornady Subsonic Rifle Ammo Review
• Best 308 Ammo
• 308 Recoil - subsonic loads are notably softer shooting

For velocity, energy, and drop numbers across the full 308 range, supersonic and subsonic alike, see our 308 ballistics database.