I've seen a few videos where they make a lube from beeswax and lamb tallow. They claim the lamb tallow doesn't go rancid but I still can't see a meat byproduct being a good long term solution. I'm wondering if you could do the same with a vegetable shortening or if there would be some other synthetic option.Leaving a C&B revolver loaded over a long period of time isn't a mystery. Load as normal...you could put a card wad between powder and ball but as it's going to get crushed it's both meaningless and does nothing. Don't use a lubed fiber wad, the lube will contaminate at least part of the powder. Use a lube over the balls, just use a heavier lube. I have taken to using the same lube I use for BPC bullets. It's a little stiffer and doesn't melt as readily. Paint clear fingernail polish over the caps and your done.
This stuff ain't rocket science....
And it may not be rocket science but they did try to use BP to make rockets at one time!