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When a bullet exits a target, it typically creates a small entry hole on the side where it penetrates and a larger exit hole on the opposite side. This occurs due to the way the bullet travels through the material of the target. When a bullet enters, it displaces material in a relatively contained manner, resulting in a small, relatively clean entry wound. However, as it exits, the bullet pushes away more material due to the force and energy it carries, which leads to the formation of a larger exit wound.

This characteristic behavior can vary based on several factors including the bullet's design, caliber, velocity, and the nature of the target material (e.g., soft tissue vs. hard surfaces). In soft tissue, for example, the exit wound is typically larger due to the effects of expanding bullets or the impact energy that causes more damage as the bullet exits. Therefore, the formation of a small entry hole and a larger exit hole is a common observation in ballistic injuries.