Greasing the ball isn't difficult. You do need a double boiler to melt the grease. I've made a grease with bee's wax and with the cartridge assembled to the point of having the ball tied in the cylinder, you simply dip the paper wrapped ball in the melted mix of wax and oil. I use 1 part Bees wax to 7 parts of (very cheap) olive oil. All the oil keeps the cooled mix soft which makes it easier to load. Others may recommend a different grease or lubricant.
Something to consider when making the cartridge is to make a dowel form to wrap two layers of paper that will slide down the barrel. I do hold a few cartridges back that weren't dipped so that I can spit on the ball to effectively wipe some of the fouling down the bore.
Something to consider when making the cartridge is to make a dowel form to wrap two layers of paper that will slide down the barrel. I do hold a few cartridges back that weren't dipped so that I can spit on the ball to effectively wipe some of the fouling down the bore.