I think most bullets have always been made, principally, of lead. Lead is soft, heavy & easy to mould or cast. In the times of Musketry bullets were spherical, rifling improved their ballistic qualities and they became pointed cylindrical in shape. Nowadays they are coated in copper, but lead is still their principal metal.
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copper plated lead
In world war one, helmets where made of steel, to help protect your head from any bullets or other weapons used (:
bullets.
No
around 41 billion bullets were made in the u.s.a. that's enough to kill the worls population 17 times