Who made the 303 British?

The .303 British cartridge was developed by the British government and introduced in 1888. It was designed for use in the Lee-Metford rifle, which later evolved into the Lee-Enfield series of rifles. The cartridge became widely used by British and Commonwealth forces throughout the 20th century, particularly during both World Wars. Its design was influenced by earlier military cartridges and was standardized for military use.