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BUT I'll have to revise what I posted last night. I just took that case I crushed so easily, cut it with a tin snips. It's clearly only a surface coating of copper. Then I stuck another copper colored one in a lee spinner, spun it holding some steel wool against it. The copper came right off, it's a very thin film. No matter though, some of the zinc is gone, therefore some of the strength is also gone, so in the recycle bag it goes.
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OK, that's more consistent with what I expected you'd find. All things considered, you'd loose the same amount of outer layer by tumbling off oxidation from a case. I would seriously consider not junking these cases just yet. With such a minute amount of removal from brand-new brass, there shouldn't be any issue at all with weakening.