Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
This is hard to really say as in some ground one coil is deeper and in other ground the other one is deeper. You can GB all you want, but the larger the coil the more minerals it "sees."