Cowboys Didn't Fully Load Their Pistols
From Redditor u/b1g_n0se: TIL the "Cowboy Load" - in the Wild West - it was most common for six-shot revolvers to only be loaded with five rounds. A live bullet in the chamber below the hammer of a 19th century single-action revolver can be set off with a sharp knock, hence it was not desirable to carry one fully loaded. Context: Most revolvers from the 19th century had six chambers, but most cowboys loaded only five shells, called a "cowboy load," because firearms didn't have safety measures yet, and the hammer was a little finicky and could fire if the piece was jostled incorrectly. To save themselves, their horses, or the people around them, most cowboys kept the hammer on the empty chamber to stop any possible misfires.
