I was recently given about 600 once fired M2 Ball cases from an estate clean up. These were stored in the original 1952 St. Louis Arsenal pasteboard boxes after they were fired (all the same production lot #). Some of the cases had fingernail sized corroded areas on them. I tumbled the brass in my tumbler with stainless steel pin media, which removed all the corrosion. What is left is a black stain where the corrosion was. I cannot see any difference between the cleaned corroded area and the uncorroded brass except for the black discoloration (using a 20X optivisor to check for surface anomalies).
My questions are:
-with the corrosion removed (except for the staining), is this brass safe to shoot?

-do I need to anneal this brass before using it?

Thanks for all replies
Tom
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