You can buy the phials for next to nothing on the bay. Make yourself a little board with fifteen or so double rows of holes/indentations to load up with powder phial/ball. Most comps are 13 shots with ten to count though some are 15 shots. This way it's very easy to keep a track of how many you've fired. I only ever use proper BP. Kranks for playing with and the more expensive Swiss for comps and the smaller calibres.