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This will chamber and fire all standard 300WM the lenght is not available on Savages website. You could always contact savage for an exact answer https://www.savagearms.com/content?p=contact

Kevin, I don't think this magazine gives much more length than 3.6 inches (standard 300 Win Mag OAL runs 3.34 inches). I would get more precise measurements from Savage Customer Service at (800) 370-0708 Monday through Friday 8:00AM – 5:00PM EST