The difference between supersonic and subsonic ammunition lies primarily in the velocity at which the bullet travels.

1. Supersonic Ammunition:
   • This ammunition travels faster than the speed of sound, which is around 1,125 feet per second (343 meters per second) at sea level.
   • Characteristics:
     • Typically louder due to the sonic boom or "crack" created when the bullet breaks the sound barrier.
     • Generally, has higher velocity and energy, which leads to more rapid target engagement and potentially greater stopping power.
     • Commonly used in military, law enforcement, and hunting applications.
2. Subsonic Ammunition:
   • Subsonic ammo travels below the speed of sound, generally below 1,125 feet per second.
   • Characteristics:
     • Quieter than supersonic ammunition because there is no sonic boom, making it more suitable for suppressed firearms.
     • Has less velocity and energy compared to supersonic ammo, which can result in a slightly reduced effective range and stopping power.
     • Often used in tactical situations or by civilians for noise reduction (e.g., for home defense or pest control).

To summarize, supersonic rounds are faster and louder, while subsonic rounds are quieter but slower, often used with suppressors for stealth or noise-sensitive environments.