Argo44,
I was helping the family of an old friend that had a business loading custom ammunition and the son-in-law was helping the widow sell the shop items. Since he was not adept at that kind of work, I did it so they could sell the cases, I left the cleaning and polishing to him. You can't sell powder in off brand containers, so I kept it and kept the bullets because they were severely marked by pulling them. I sized some of the bullets to .427" and used then in 45-70 class loads for deer hunting with my 404 Jeffery.
As fate would have it, I ran across a You Tube video that was partly appropriate to the subject of this thread. You Tube Mr. Pete 222, #1052 What caused the crack? was a discussion of a crack in the body of a brass blow torch but lead to stress cracks and cracks in WW1 ammunition exacerbated by horse urine (ammonia). It will more than worth the effort to watch it, as well as his many other videos.
Mike
