The Bullet Test Tube from Ballistic Technology is a proprietary mixture of non-toxic, infinitely re-useable materials that allows for the measurement of every critical aspect of terminal bullet performance. Penetration, retained weight and expanded diameter are a few of the key critical performance aspects that can be measured for each bullet on the market. The most important and significant attribute of the "TUBE" is its ability to capture the wound cavity created by the bullet. This allows an understanding and precise measurement of the wound cavity size and shape for each bullet tested. The "TUBE", unlike any other commercially available bullet testing media, permits the wound cavity to be measured by volume. The "TUBE" is reusable, safe, and offers a consistent median to test bullets. Most importantly it can be stored at room temperature for an extended period of time until needed.