The SK Biathlon Sport cartridge is a result of Innovative engineering, and a long history of close co-operation with top biathletes. The bullet has ideal velocity for frigid conditions, and it is designed for optimum ballistic performance, even in tough and windy conditions. The SK Biathlon Sport round has a special lubricant designed specifically for perfect performance in freezing weather. This biathlon round combines effective and reliable energy with the finest accuracy. The SK headstamp is the true sign of quality rimfire ammunition.