Prwlr,
Thanks for your thoughts. I did not tumble the brass. I treated these cases the same as I treat all my rifle cases.
I use 0000 steel wool to clean the outside and clean the inside of the necks with the nylon brush and mica powder in the Midway case neck lube kit.
Yondering,
Salt? Possibly. But I normally never eat or drink in my loading room and I usually wash my hands before starting loading. And I always wash my hands when I am done loading, just as a precaution due to lead exposure. Cheap health insurance, even if it isn't needed.
If something like salt exposure could have done this, it seems like I would have seen it before sometime over the years. And it does seem like the corrosion started on the inside of the case.
Just supposing that I did do something weird with this lot of cases all those years ago, it seems like someone in the Campfire universe would have also seen this happen before.
It would be nice to solve this mystery.
