is quick to notice iron ! I dig up some of it up too, but not nearly as much with the 5 inch coil. I think most of it is that you have to be able to isolate/locate a target before it can be evaluated for consistency and whatall. Nails, bolts, screws, and the like often reveal themselves unless not lying flat or seriosly bent, etc. Washers are just hateful but old, really rusty iron bottle caps are often "inconsistent" and not "compact" like coins or rings. I usually run in Enhanced Mode with minimum tolerable discrimination and kind of a "Zen" attitude. Seems to work once in a while.