AFTE Store - Understanding Caliber Designations: A Study of .380 Auto and .380 Revolver Cartridges

Firearm calibers are sometimes subtle due to different designations used around the world and over time. History has shown that over the years, cartridges have become obsolete, expanded, and been created due to popularity, specific use, or to meet the needs of both firearm users and industry. Due to these changes, popular calibers often take on numerous caliber designation synonyms which may often confuse firearms examiners.