Hi all, I too would love some advice, have owned my GPX 5000 for 18 months, in that time have only ever founds dozens of bullets, bottle tops, fine wire, nails, lead slugs smaller than match heads; you name it I've dug it up, including a cast iron wheel off a mine trolley? When I purchased off the Minelab outlet here in bendigo, they suggested putting a nugget finder coil on instead of the factory coil, however after 18 months I still love getting out there but I'm starting to think something isn't right and it all points to me? Please assist? Mathew