The Colt Walker, sometimes known as the Walker Colt, is a single-action revolver with a revolving cylinder holding six charges of black powder behind six bullets (typically .44 caliber lead balls). It was designed in 1846 as a collaboration between Captain Samuel Hamilton Walker and American firearms inventor Samuel Colt.The 1847 Colt Walker was the most powerful handgun available up until the 1935 debut of the Smith and Wesson model 27, the very first .357 magnum chambering. The Colt Walker was created in the mid-1840s in a collaboration between Texas Ranger Captain Samuel Hamilton Walker (1817–1847) and American firearms inventor Samuel Colt (1814–62), building upon the earlier Colt Paterson design. Walker wanted a handgun that was extremely powerful at close range.