Too- you could also use a slightly smaller ball and go with a cloth patch. Lubed with Neetsfoot oil, Mink oil or other concoction, they can easily take up space. Now why didn't I think of that before - in this thead?
These are Magtec cases for my 2 1/2" 13 bore striaght rifled barrel on my 16 bore Husky. The cloth patched and undersized balls are more accurate than those that engrave, shoot cleaner and are easily loaded with a simple crimp.