Yes, you can simply swish table salt in tap water for the experiment. All you are looking for is red iron oxide forming on the bullet jacket. Cupronickel won't "rust" like that.
If it is iron, well then keep them around for trading stock, somebody has probably read the sci-fi novel "Sleipnir" and remembered what iron bullets do to fay creatures.
Jimro
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Machine guns are awesome until you have to carry one.
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