This can be confusing if the conversion is unknown.Ĭalibers range from very small to very large. 32 Auto is equivalent to the 7.65 Browning, and the. 25 Auto is equivalent to the 6.35 Browning, the. In many other countries, these are expressed in millimeters. With one bullet found at a crime scene it is possible to determine which firearms could have fired the bullet, and therefore, enhance the search for a suspect.Ĭalibers are usually expressed in hundredths of an inch or thousandths of an inch in the United States and in Great Britain. This is extremely important evidence in a forensic investigation. In addition, by looking at other characteristics imprinted on the bullet, it is possible to further narrow the possibilities. Once the caliber of a cartridge is known, it is possible to obtain a list of firearms capable of firing such a caliber. The caliber of a cartridge can usually be determined from the size, weight, and shape of the bullet. In many instances, the numerical value of the nominal caliber corresponds to the factual caliber, but this is not always the case, as some variations might appear. Second, the nominal caliber of a bullet refers to its nominal diameter and the characteristics of the cartridge. First, there is the factual term caliber that is defined as the internal diameter of the barrel of a firearm. There are two recognized definitions of caliber that differ slightly.
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