The Remington Model 597 Magnum chambers the .22 WMR cartridge in the same platform as the .22 LR 597. One of the few semi-auto .22 WMR rifles available. Type: Semi-Auto Rifle Action: Blowback Caliber: .22 WMR Capacity: 8 Year introduced: 1998, USA Weight: 5.5 oz Overall length: 40" Status: Active Intended use: Small Game, Varmint, Plinking