The Model 647 is a stainless N-Frame revolver chambered in .17 HMR — a high-velocity rimfire cartridge in an N-Frame package. The large frame was necessitated by the cylinder dimensions required for .17 HMR case feeding reliability. Type: Revolver Action: Double-Action Caliber: 17 HMR Capacity: 6 Year introduced: 2003, USA Weight: 52.5 oz Overall length: 18.5" Status: Discontinued Intended use: Varmint Hunting