ICORE was founded in 1991 by Mike and Sharon Higashi, long time active shooters in all the handgun sports. Envisioned as an alternative to the "arms race" that was occurring in the other action shooting sports at that time, a revolver-only competition would allow even the most basic equipment to be used and still provide enjoyment and satisfaction. ICORE combines elements of the Bianchi Cup, IPSC, and the Steel Challenge into demanding competition exclusively for revolvers.
 
The Bendigo Pistol Club Victoria held the first match in Australia 2001. ICORE Australia hold a annual 3 day national competition hosted by any affiliated club in Australia. ICORE Australia currently has a major sponsor being Lone Ranges in Perth who provides valuable prizes for the regionals each year.