The author of the book I was reading tells how many preferred the muzzle-loader over the breech loader for several reasons, like how easy it was to immediately tailor your load to the existing condition and how you weren't bogged down by paper or metal hulls.
He told how when shooting a breech-loader he had to stay up late at night loading his shells for the next day of shooting while his hunting buddies that shot muzzle-loaders were getting much needed rest.
Pete