Hi, i have been detecting on and off for about 3 years now but have yet to find anything, I often go on my mates field which was said to be in the grounds of a roman castle yet it has not produced. I have also tried beaches but have fund nothing of value. I currently own the tesoro stingray, but i find it hard to discrimnate against iron. May this be the main reason? If so what machines do you reccomend? Please give any other advise. Many thanks