Welcome back Bill. I hope the .58 does well for you. I had one for a while & did some work on the fences and nipples to get the fences into operating procedure, without the main springs breaking out the bottom of the lock inlay - need to be careful.
As well, I found once de-greased, the shiny lock plates and trigger guard can be darkened with Birchwood Casey's cream cold blue.
My .58 shot both barrels into a single hole group at 50yards, with 100gr. 2F, using a .574" ball, .021" denim patch(10 ounce) and a wet lube. I did not work up loads with a hunting oil or grease.
In my rifle, 110gr. made the barrels shoot perfectly parallel.