Ammunition designed for the .223 Remington cartridge achieving velocities below the speed of sound is a specialized area of interest for firearms enthusiasts. This involves carefully selecting specific bullet weights, powder types, and charge amounts to achieve optimal performance without exceeding the sonic barrier. For example, a combination of a heavier projectile and a reduced powder charge can yield subsonic velocities, resulting in quieter report and different ballistic characteristics compared to standard supersonic ammunition. The “1” appended to the term likely indicates a specific dataset or version of load information within a larger collection.
Reduced noise levels offer advantages in various shooting applications, such as hunting or target practice where minimizing noise pollution is desired. Furthermore, subsonic loads can be paired with suppressors for even greater sound reduction. Historically, the development of subsonic ammunition has been driven by the need for quieter firearms in military and law enforcement applications, as well as by civilian shooters seeking a more discreet shooting experience. The precise tailoring of these loads allows for optimized performance within the specific parameters of subsonic flight.