For example, a popular caliber in the United States is the .45 ACP. It is the largest practical handgun caliber in use, featuring a bullet that is in diameter. With well made expanding ammunition, a .452 bullet often expands to .70 caliber or larger. With a 9 mm Luger bullet, for example, its normal .355 diameter might be hoped to expand to .50 caliber or larger. This could give a preference for larger caliber bullets, as they do not rely on expansion as much as smaller caliber bullets do to provide incapacitation. However, multiple tests and actual data from shootings have not found this to be true.