I made shotshells for my 1917 S&W by cutting 30-06 brass to cylinder length, turning the case to get a little step to seat at, then loading with equal measures of shot and pistol Pyrodex (didn't want to worry about pressures). The powder and shot were separated by a wad, and the cases sealed with an over-shot card. This yields a much larger shot charge than capsules. My first loads had a problem with old, unreliable primers, and I haven't had a chance to repeat the experiment.