Hi Guys, my best coil on the extreme is a very old n/f 17/10 fiber glass coil 12 years old mono killer on small or larger nuggets, biggest nugget 7.61ounces smallest 0.01, The 5000 i run a 14x9 n/f or a 12x7n/f, biggest nugget 39.1gran at 15 inches, I have tried bigger coils but it just dont cut it, maybe when i work out the new settings it will be better, I dont get to the gold field enough to work it out, Both detectors well and turley paid for them selves, Ron,