The velocity of a 223 caliber projectile depends on several factors, such as the specific firearm, ammunition, and barrel length. However, on average, the muzzle velocity of a 223 caliber bullet fired from a rifle with a standard 20-inch barrel is approximately 3,200 feet per second (fps) or 975 meters per second (m/s).

It's worth noting that the actual velocity of the bullet may vary based on the specific load and firearm combination. Some high-velocity rounds may have muzzle velocities exceeding 3,500 fps, while subsonic ammunition designed for specialized applications may have lower velocities. Additionally, factors such as barrel length, rifling twist rate, and environmental conditions can also affect the projectile's velocity.

For precise information about the velocity of a specific 223 caliber projectile, it's best to consult the firearm manufacturer's specifications or refer to reliable ammunition data from reputable sources.