The Cimarron Firearms New Thunderer is a usa-made double-action revolver chambered in 357 Magnum, introduced in 1993. Primary use: Cowboy Action, Collecting. Type: Revolver Action: Double-Action Caliber: 357 Magnum Capacity: 6 Year introduced: 1993, USA Weight: 37 oz Overall length: 10.75" Status: Active Intended use: Cowboy Action, Collecting