The muzzle velocity of FMJ (Full Metal Jacket) ammunition can vary depending on several factors, including the specific caliber, bullet weight, and the load used by the manufacturer. FMJ ammunition is typically used for target shooting, training, and general-purpose shooting applications.As an example, here are some approximate muzzle velocities for commonly used FMJ ammunition in popular calibers:

• 9mm Luger (9x19mm): Muzzle velocities can range from around 1,000 feet per second (fps) for lighter 115-grain bullets to approximately 1,200 fps for heavier 147-grain bullets.
• .45 ACP: Muzzle velocities for FMJ ammunition in .45 ACP can range from around 800 to 950 fps, depending on the bullet weight. Common bullet weights include 230 grains.
• .223 Remington / 5.56x45mm NATO: FMJ ammunition for these calibers typically has muzzle velocities in the range of 2,800 to 3,200 fps, depending on the bullet weight. Common bullet weights include 55 grains and 62 grains.
• .308 Winchester / 7.62x51mm NATO: FMJ ammunition for .308 Winchester and 7.62x51mm NATO can have muzzle velocities ranging from around 2,600 to 2,800 fps for common bullet weights such as 147 grains and 150 grains.

It’s important to note that the specific muzzle velocity of FMJ ammunition can vary between manufacturers and individual loads within a given caliber. It’s always a good idea to refer to the manufacturer’s product information or consult ballistic data from reputable sources for precise and up-to-date information on the muzzle velocity of a particular FMJ ammunition load.