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My club is an indoor range, and will not allow any jacketed ammo, but will allow copper plated (they sometimes call it "copper washed") ammo. My understanding is that the copper plated bullets reduce (but don't eliminate) leading, but the copper isn't "structural" in the sense that it doesn't help the bullet hold togeather. Therefore, it will behave, more or less, like an all-lead bullet on impact.
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