Hornady Subsonic Ammunition, designed for accuracy and performance below the speed of sound. Hornady Subsonic Ammunition doesn't have the loud report of a supersonic round, and paired with a suppressor, its even quieter. Unique powders optimized for subsonic use result in a low flash signature, ideal for either suppressed or unsuppressed performance. This model is a 410 gr 45-70 Government caliber and includes 20 round per box.