I was just given two unopened containers of Goex Cowboy black powder. I have always used FFF Goex in my ML rifles and have never done BP blackpowder shooting. Is the Cowboy Goex similar to 2F or 3F or is it exclusively for cartridges? How is it different? Are the pressures the same? I do have a Blackhawk in 45 Colt so what might be a light start load for a beginner (ie 20 gr by volume)?