Some nails just seem to register like coins. I dug a rusty screws today that hit like solid quarters. I have pulled a lot of "iffy" nails that I thought were going to be nails, and I have dug nails that hit like solid coins. I always expect to find a coins with them in the hole, but sometimes its just the nail. I don't know if it has to do with the type of metal (forged iron, different grades of steel, coated / uncoated) , the position, of some combination of it all.
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