A tranter revolver developed to be the first cartridge revolver in the British serveses. It uses a paper cartridge with metallic buttum laer drawn bras, they saw some use against tigers in India. In Australia they were liked too And it is to my knowledge the biggest caliber revolver yet made ( Clint Estwood go home)
16.9 / 17.2 mm, 5 shots, manufactured in 1865-70 for the British officers of the Indies Army.

Photos and information from: Peter Rasmussen and  Roger Desbois