Remington is one of the leaders in rimfire ammunition advancements. Their wide variety of loadings means that you are sure to find the right ammunition for your needs. Great for competition, hunting or plinking. NOTE: Subsonic ammunition may not cycle properly in all semi-automatic guns. This is a result of the decreased velocity/energy of the ammo. If your semiautomatic has not been specifically tuned to work with subsonic rounds it may not have sufficient energy to cycle the action.