One of the pattern I use a lot if I am looking for the deep coins is to go to advances and go to the learn screen and black out the whole screen, then go to the edit and use the large cursor and go to the top right with it and hit the check mark so it will accept (the cursior will go white) and run it accross the top of the screen to the left untill there is only maybe 1/4 inch that is black. Now turn off the accept by hitting the button again. Now I will go back to my learn mode and turn down the sensitivity and learn in the nickle using the medium cursor. Now you just have to save it in one of you slots.
Now this pattern will get all your good coins and reject most of the trash, but you will get fooled more with the nickles and beaver tails off the old pulltabs. If you run ferrious the good coins will be high pitched and if you get a coin beside a nail the audio will be high pitched, but cross hairs may show iron so go around the target and see if it is repeatable, if it is dig it as it is good.
Rick