How do copper bullets behave in extreme temperatures?

Behavior in Hot Temperatures

Copper bullets are known to lose their hardness and expand when exposed to high temperatures. This is because copper’s melting point is relatively low, around 1,085°C (1,985°F). When the bullet’s core temperature exceeds this threshold, it can lose its structural integrity and fail to expand properly upon impact, resulting in reduced accuracy and penetration. Additionally, the expansion can cause the bullet’s jacket to separate from the core, leading to a loss of kinetic energy and potential injury to the target or surrounding area. In extreme cases, the bullet may even melt or disintegrate, rendering it useless for hunting purposes.

Behavior in Cold Temperatures

Copper bullets can become brittle and prone to cracking when exposed to cold temperatures. This is because the metal contracts and becomes more rigid, making it more susceptible to cracking and breaking. A temperature drop of as little as 10°C (18°F) can cause copper bullets to become brittle and lose their structural integrity. To mitigate this issue, hunters can consider using a monolithic copper bullet with a higher copper content, such as a 90% or 95% copper bullet, which can provide improved toughness and resistance to cracking in cold temperatures. Alternatively, hunters can consider using a different type of bullet material, such as lead or brass, which are less prone to cracking and breaking in cold temperatures.