If you have ever looked inside a Maxim or Vickers, it will blow your mind as to how someone could design such a thing.
And Hiram was not copying or adapting the work of others before him.
The cartridge gets pulled rearwards from the belt, then dropped downwards, then pushed forwards into the chamber.
This is not the final version, but sort of similar.
https://www.youtube.com/watch?v=hiFGKWPSaas
[youtube]hiFGKWPSaas[/youtube]