SK Standard Plus in Nammo's standard training rimfire ammunition. For many years, the SK Standard Pls has been considered to be a reliable training cartridge by 22LR Sports shooters across the world. Its versatility in use means it can be used in both rifles and pistols. Continuous further development of SK ammo guarantees reliability, precision, and stability in the remfire ammunition segment. Shooters across the work trust SK Standard Plus as the entry-level rimfire cartridge to try for these very reasons.