Winchester USA223L1: Backed by generations of legendary excellence, Winchester\'s \"White Box\" stands for consistent performance and outstanding value, offering high-quality ammunition to suit a wide range of hunter\'s and shooter\'s needs. If you are looking for some of the most reliable range ammunition, then this is it. This particular ammunition is Boxer-primed, brass-cased, and fully reloadable. This ammunition comes packaged in (4) 150-round value packs inside of a 600-round master case. We sell it under this SKU by the 600 Round Case.