I would do it yourself and its not as involved as it might sound. All hand tools with simple components. Not to keep posting videos, but here is a good one on loading 10 gauges brass shells from Midway:
https://www.youtube.com/watch?v=VI47bl2h0cU&t=73s
The good news is you can buy new cases from track of the wolf and not go through what Larry went through on the video. The rest is straight forward.
Something to consider and it's always fun to shoot the shells these old guns were intended to shoot when new.