These easy-to-use paper cartridge formers allow you to make paper cartridges for the Colt Walker and other revolvers in .44, .36, and .31 calibers. They even have built-in powder measures! The built-in powder measures are as follows: Walker-40 grains, .44 caliber-25 grains, .36 caliber-17 grains, .31 caliber-10 grains. A powder funnel is included. They are also available in complete paper cartridge kits. Here is the instructional video for my paper cartridge kits and formers: