When we used them, the overpowder wad was introduced into the bore, then the post-it note, then shot poured in, then the overshot card and everything pushed down.
Special ctgs. could be made containing shot & wads. "These Ctgs." of wads and shot were actually commercially made in England and sold to sportsmen there. They also
went further to having the shot contained in a wire cage with varying thicknesses of wire which release the shot more slowly or more quickly and these were colour coded
as to the effective range. If I can find it, I'll post a picture of an Ely shot ctg. The picture notes "Breech Loaders" on the ctg. but basically the same system was used in ML's.
The longest ranged ctg. was noted for shooting birds at 80yards or further, but could be used for wolves and deer out to 50ayrds, where it acted like a slug.