Pape patented choke boring in 1866 but it is believed Joe Manton was 'freeing the bore' behind the muzzle, mentioned in Hawkers 'Instructions to Young Sportsmen' published in 1816
Kimble is credited in the U.S. with being the inventor but not until 1869.The Field trials were in 1875 at Wimbledon Common.Interestingly there were previous trials held in New York in September 1873 in which the first two places in four categories were won by W&C Scott guns possibly rebored in the US by W.H.Van Gieson.