The Defensive Handgun Test Tube is a bullet testing medium that provides a total understanding of bullet expansion. Designed to provide shooters with a means to evaluate the terminal performance of defensive handgun ammunition, the handgun tube has been specifically formulated in ballistic blue to illustrate a handgun bullet's potential for tissue trauma during expansion and penetration. The tube is one of the only commercial bullet testing mediums that will permit the wound cavity created by the bullet to be measured in detail to include volume. Ballistic Technology's Defensive Handgun Test T ube will capture the wound cavity created by any bullet commonly used for personal defense. For magnum cartridges two Defensive Handgun Test Tubes can be used together.