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The misconception that bullets are made entirely of copper likely stems from the fact that many bullets have a copper jacket. Here's a bit more detail:

1. Copper Jackets: Most modern bullets are made with a lead core encased in a copper jacket. This jacket helps to reduce barrel wear and improve the bullet's performance by preventing lead fouling in the barrel.

2. Solid Copper Bullets: There are also bullets made entirely of copper, known as solid copper bullets. These are often used in hunting and are praised for their deep penetration and weight retention. However, they are less common than lead-core bullets.

3. Environmental Concerns: The use of copper in bullets has increased due to environmental concerns. Lead can be toxic, and copper is seen as a safer alternative, especially in areas where lead contamination is a concern.

4. Historical Use: Historically, bullets were made from various materials, including iron and steel, but copper and lead have become the most common due to their favorable properties.

So, while not all bullets are made entirely of copper, the presence of copper in bullet construction has led to this common misconception.