MEC,
I think you're right. I've never made nor used cartridges, no need to, except mebbe for experimenting like was on these forums a few months ago. Everybody was getting into it, no one mentions them anymore.
Probably a soldier could load a C&B in a minute or less, none of this spring valve flask poured into a measure and tap to settle, then top off, then flip the funnel top and pour, then repeat 5 times, then seat 6 balls then cap.
WE are so damned cautious we'd NEVER pour from the flask, they'd never dream of making up a target charge with a measure. They wanted to get back to shootin' in a hurry. Fill the chambers enough to cram a ball in and cap and shoot.
BTW, have you ever seen a capper from that era, or did they all cap singly? Can't believe no one made one up for sale, whether Colt or an aftermarket outfit.
Cheers,
George