Several years back there was some discussion about the Pro coil not doing well reading rusty iron. I have had every Explorer series made and I even bought a Pro coil for my Ex 11 when the coil was introduced. I never had any problem dealing with iron, but recently I am digging more deep rusty iron than ever with my SE Pro. I seem to remember several of the regulars including the former moderator swearing by the SEF 10x12 on an Explorer. I hunt in iron mask screen with the setting at 22-24 and manual sens between 20 and 26. If any of the old timers are still swinging an Explorer with an aftermarket big coil, please share your experiences with me. Thanks!