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Not very well if they have a lead core. Cupronickel is the jacket material and is not thick enough to hold up itself to much metal penetration. If the bullet has a steel core then the core would allow it to penetrate most steel plate depending on velocity of the bullet and thickness of the steel armor it was shot at. Even though the cupronickel bullet is somewhat shinny they are usually composed of approximately 75% copper. Currently there are no cupronickel bullets built to penetrate armor. Cupronickel bullets are old technology and were developed mostly by the Russians in about 1908.

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