A metal jacket bullet is a type of bullet used in firearms, where a soft core (usually made of lead) is encased in a harder metal jacket, typically made of copper or brass. The metal jacket is usually formed around the core through a process called "jacketing."
This led to (Declaration III), which banned the use of "bullets which expand or flatten easily in the human body." The solution was the full metal jacket. By covering the soft lead, the bullet retains its shape on impact, creating a smaller, cleaner wound channel that theoretically passes through the target. metal jacket bullet