Fascinating article Aaron, thanks. Having read the 19th century London press for 6 years it's my impression that to be a "gentleman," you had to do two things (in addition to birth and schooling), hunt/shoot and gamble. Thanks again. (wondering who made those Lefaucheaux guns).
Argo, you missed one trait of a British gentleman of that era, assuming they copied the behavior of the Prince of Wales: Chase women. The prince's interest in driven shooting certainly helped to make it more popular in Great Britain.