3. A dastardly terrorist wanders into view. The secret agent raises his weapon and coolly squeezes the trigger. On the street below onlookers hear an innocuous “fut” sound. The secret agent steps back from the window undetected, his assignment completed.4. Unfortunately for the secret agent, he’s not so likely to go undetected. A 7.62 NATO round is supersonic and would cause a miniature sonic boom even if the muzzle blast, but it does produce a very noticeable noise which can draw attention to a shooter.
