In 1898, John Rigby & Company loaded the .450 Black Powder Express with smokeless cordite creating the .450 Nitro Express, the first Nitro Express cartridge, this was to have a profound impact on sporting cartridge development and the double rifle was to become synonymous with the Nitro Express cartridges. Now in its final form and chambering modern Nitro Express cartridges, the British double rifle entered its golden age at the turn of 20th century and it was to last for the next three decades, with the birth of the White hunter and professional hunting safari industry in East Africa.