The Nautilus is still the depth king I don't care what anybody says. If you are in good ground nothing can touch it. I dug a stirrup at over 3 feet and yes it was iron but it sounded like a conductive signal. I swing the 15" coil and can dig buckey balls as well as minies at extreme depth. Now,it is a heavy sucker and I am nearer to 60 than I was when I first bought it but I'll never get rid of it. I have the Tejon, F75, and just added the Gold Bug to my arsenal for difficult ground but I love the Naughty 2B and always will. It is the relic hunters tool!