Shooting supersonic rifle ammunition can be become draining due to the noise and recoil generated by repeated shooting. Subsonic ammunition maintains its relatively low velocity by reducing the powder charge in the cartridge, and increasing the weight of the projectile. Subsonic ammunition can greatly decrease the fatigue experienced by shooters allowing for more rounds downrange.
SUBSONIC AMMUNITION: Advantages of Reduced Recoil Shooting
Less fatigue generated by recoil
Less fatigue generated by sound signature
Faster follow up shoots
Allows for smaller statured people to enjoy shooting