Hmmm -- interesting question, and I don't really have any answers.
Silver is nearly the same specific gravity as lead, so a silver bullet should retain energy and such as well as a lead projectile. No idea on how the other characteristics of the metal would translate into ballistic performance.
I'd think a gold bullet would behave like a lead one, only be quite a bit heavier. You might have to use some sort of gas check or similar to protect the base of the bullet from powder gasses (and some sort of jacket as well if you're using it in an autoloader).
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