I have not tried to handload any alum cases, but did handload a few old 45ACP steel cases from WWll. It wasn't really intentional, but they came out of my case tumbler looking like a dull nickel coated case, and it didn't dawn on me that they were polished steel cases. They not only loaded o.k., but they shot fine. I am not recommending this, as I am very careful of my sizing dies, but it can, and has been done.
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