I use the MXT in relic mode, center switch position. I set the discrimination to the 3 o'clock position, so all clad, copper, zinc, & silver will give a high tone. Nickels & most junk will be low tone. I turn up the sensitivity all the way or close. I ground balance, then usually lock, as this sometimes gives slightly more stable IDs & maybe slightly stronger signal. This works good in trash. Only have to look at meter if trying for nickels & gold. Sometimes do, sometimes don't. The nickels when shallow lock on 18, jump 18-20, or lock on 20. Modern pulltabs read 22 or higher, except bent ones can read 20. The old steel bottlecaps can signal as coin, but with short fast sweep in track position, numerical ID will go down (if a coin, ID will likely stay the same. Screwcaps often ID about 70-75, zincs 55-75, copper 76-80. And the screwcap will be wider in pinpoint & screwcaps (shallow) more likely to give overload indication. Cans can ID as quarter, but wider in pinpoint & also can try raising coil. If depth reading doesn't increase by 1" for each inch you raise it & you're still getting signal a foot in the air, it's too big for coin. Detecting in new places, I just stick screwdriver in ground various spots near each other & can tell if it's a can that way. If you remove dirt to the displayed depth & signal is still in center of hole, it's probably biggger than a coin. HH, George (MN)