Weatherby 307 Range SF, Bolt Action Rifle, 7MM Backcountry, 20 Threaded Barrel, Cerakote Finish, Graphite Black, 5 Rounds, 1 Magazine 3WR047MMBR0T The Range SF is built on Weatherby's newest bolt action rifle platform, the Model 307. Meant to complement the historic Mark V and Vanguard lineups, the Model 307 action is a 2-Lug, fully cylindrical action compatible with many aftermarket accessories. Model 307 is designed to accommodate the vast offerings of stocks, triggers, rails, mounts, and magazines that exist in today's marketplace. The Range SF is a shooter-friendly platform that can dominate the shooting range or the mountain range.