The Ruger Single-Seven in .327 Federal Magnum with 5.5-inch barrel. A seven-shot single-action revolver chambered in .327 Federal Magnum. The .327 Magnum's smaller case diameter allows a seventh round in the cylinder compared to .357 Magnum six-shooters. Type: Revolver Action: SA Only Caliber: .327 Fed Mag Capacity: 7 Year introduced: 2014, USA Weight: 39 oz Overall length: 11" Status: Active Intended use: Hunting, Target, Collecting