SK Standard Plus .22 LR Ammunition For many years, the SK Standard Plus has been considered to be a reliable training cartridge by 22 lr sports shooters across the world. SK Standard Plus is a very versatile rimfire round, and it can be used in both rifles and pistols. We constantly continue to develop SK's ammunition to guarantee reliability, precision and stability in the rimfire ammunition segment, from training level to match standard. This includes making sure that SK Standard Plus continues to be a successful entry-level rimfire cartridge for any smallbore shooter to try. 50 Ct Box Ballistic Data: Weight: 2.59 g/40 gr Test Barrel Length: 660 mm/26 in