Every day my wife takes our daughter to work and stops at the parks for a hour or so to detect on the way home. She got her usual around $2.00 of clad coins today and tells me no nickels. I haven't given it much thought but now that I think of it since using the 4" coil on my (our) F4 I haven't found a single nickel with it either and very very few pull tabs. What's up with that? I'm not discriminating them out, I'm using the factory discriminate mode & nothing notched out. Any ideas? Thanks! Steve.