X-Bolt Composite Stalker in 22-250 Rem. Matte black composite stock, matte blued steel, 22" barrel. The Composite Stalker is Browning's entry-level synthetic X-Bolt — a weather-resistant, practical varmint and deer rifle. Type: Rifle Action: Bolt-Action Caliber: 22-250 Rem Capacity: 4 Year introduced: 2008, USA Weight: 96 oz Overall length: 42.5" Status: Active Intended use: Hunting, Varmint