Hey Sandman and Nick, those deepseeker minelabs may be good at knocking out iron, but they certainly won't "see through" the iron. So gates21, was your question to simply reject it, or were you wanting to see through and around it better (to combat masking)?
If you don't mind compromising on depth, various 2 filter machines are better at seeing through and around iron: Like various tesoros (like the Sabre, shadow x2, etc...), the Whites classics, etc... Or if you really want to see through nails (up to as many as 4 or 5 at a time and still see coins under them), get a Compass 77b. But your depth will be 4" max on coins, and they are a bear to keep balanced!