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As it is a rimless round, the 9×21mm is used in USPSA/IPSC competition in Open class firearms.
During the mid-1990s, gunsmiths and USPSA/IPSC shooters were looking for ways to make the compensator on IPSC Open guns more efficient.
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The 9x25mm Dillon, also known as the 9x25 Dillon by Dillon Precision, is a pistol wildcat cartridge developed by employees working at Dillon Precision for use in USPSA/IPSC Open guns.
In the 1950s, American instructor Jeff Cooper was instrumental in establishing both a combat pistol based sport, International Practical Shooting Confederation, and a combat pistol training school, Gunsite.
Tori is an NRA member and has competed in various disciplines, including USPSA, SSCA, IPSC, IDPA, Bianchi & GSSF.