I did a search for "Vetterli" on this site and read about every post that mentioned it. It looks like you've had a lot of fun with yours! At some point I may post a thread with a bunch of questions. Do you still load Trail Boss for it?
Although I no longer have the Vetterli, Trail Boss was the only powder I ever used in it.
I'll be honest I had tons of fun during the time I shot it. Researching, working up loads, etc. But after awhile the novelty wore off with every woods walk stage. It was heavy and cumbersome, and I began to long for a carbine to traipse up and down the countryside with.
I'd be happy to answer any questions, if my experience with it could help.
I do still love the awkward beauty of the beast. And what was important for me when building up my persona for GAF was Vetterlis were documented in use on the Nebraska Sandhills. Read "Old Jules", by Mari Sandoz.
In there she relates the story about when her father lost his Vetterli, or it was stolen, and he had put the word out amongst the native tribes he was friendly with, and finally they sent word they had recovered it for him. When he went to retrieve it turns out it was not his but another Vetterli belonging to someone else that the Indians had recovered.. So documented at least two Vetterlis in use on the plains of Nebraska.
The Nebraska State Historical Society has Jules' Vetterli in their collection and it is cataloged.
The story goes that Sandoz would sponsor Swiss immigrants to emigrate to Nebraska and may have had a little side business selling used Vetterlis to these pioneers.
In Switzerland, after active duty, veterans were allowed to keep their long arms as a reserve to be called up in time of need. There were lots of used Vetterlis floating around on the surplus firearm market. I have somewhere a copy of an ammunition box label for Vetterli cartridges that were manufactured by a U.S. firm, so the rifle must have been common enough in order to justify offering them to the public.
A perfect sidearm to go with it would be either a cap 'n' ball conversion revolver, or an unaltered black powder pistol with a Kirst Konverter cylinder.