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Blair, Muzzle Velocity: 1920 FPS, Muzzle Energy: 1203 ft. lbs so they are supersonic. Have a great day!

supersonic muzzle velocity is 1920 FPS

These are superonic
---------- Caliber: 300 Blackout,
Bullet Type: Full Metal Jacket,
Grain: 147 Grain,
Muzzle Velocity: 1920 FPS,
Muzzle Energy: 1203 ft.
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"300 Blackout Subsonic Ammo The speed of sound is 1,275 feet per second (fps) at sea level and varies slightly with temperature and atmospheric pressure. Planes that increase their velocity until it reaches and exceeds that mark generates a sonic boom."

This is super Sonic with a Muzzle Velocity of 1920 fps and
Muzzle Energy of1203 ft-lbs. Hope this helps.