Definitions for ".480 Ruger"
The .480 Ruger is a revolver cartridge, introduced in 2003 by Sturm, Ruger and Hornady Manufacturing. This was the first new cartridge introduced by Ruger, and was at time of introduction the largest diameter production revolver cartridge, at .475 inches (12 mm). It was quickly followed in 2004 by the .204 Ruger, the fastest production rifle cartridge.