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I don't load 9mm, but .357 etc. The casings should load equally, but I find that nickle plated cases don't last as long as brass. Use them, and when the case mouth splits, recycle them. I pretty much have eliminated most in my reloading except for some left in my plinking lot. (My plinking lot is mixed case with fewer than 50, or excessively stained etc. Good to shoot, but not up to my standards for accuracy)
As for reasons why they don't last, there is a good post 10-20 lines down called nickle vs brass.
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