The .40 is a relatively new American-made round that boasts a manageable recoil without sacrificing accuracy or stopping power. This 10mm rimless straight cartridge was originally designed in 1990 for FBI and law enforcement use following a deadly shootout. It has since become a popular choice for medium/large frame semi-automatic handguns. With an expanded hollow bullet point, this caliber is also easy to reload quickly and has an increased ammunition holding capacity. Popular with law enforcement worldwide, the rimless pistol cartridge is designed for medium-frame (9mm) semi-automatic pistols.