No. A bullet usually doesn't reach maximum velocity until it has exited the muzzle. Not all rounds are effective at subsonic velocities, so their use is impractical with some guns. But the supersonic "crack" will seem to occur away from the gun which provides some tactical advantage to the shooter.
“But the supersonic “crack” will seem to occur away from the gun....”
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That sounds logical as the bullet will reenter subsonic speed because of air friction.