Atomic Ammunition 44 Magnum ammunition is designed to hit hard, penetrate deep and expand to 150% of its original diameter. These bullets regularly expand to .75 inches, retain 99% of their original mass and penetrate more than 18 inches of ballistic medium. At Atomic Ammunition they know that you carry and use real guns, not test barrels. All of their external ballistic information is obtained from tests using common firearms that you are likely to own and use, not inflated, misleading information from test barrels. They feel that this is the most accurate and useful information for their customers, so it is the only information that they provide.