hi i went detecting on Sunday to a site that roman and hammered coins have been found ,but had no luck as usual ,as i came off the fields i saw someone using a explorer sx he was digging deep holes. as there seemed to be a lot of one way signals, which i tend to ignore. But as i did not get many good signals i dug a couple of these one way signals and they were deep but just iron bits so i spoke to the chap asking if he was digging one way signals he said as there was a lot of iron stone around you should dig all signals as he had found roman and hammered by doinng this as anyone else found this to be the case ?