Ferguson rifle

[Jim]

Ques.)You write the bullet diameter on the paper cartridge. ANS) And you'd be able to stop a read them...select the right one...neat...

It would surely be more practical to have two cartridge pouches?

There is a much simpler and more practicable solution though, I don't know how the Brits actually addressed the problem.
During the Civil War Yankees carried different rounds in their ammo pouches- standard and 1 or 2 cleaner rounds. The cleaning rounds were simply wrapped in different color paper. A quick glance told the soldier which they were.