You won't pass up silver, trust me. Silver should ring in at 82-84 if it's a dime, and 87-89 if a quarter. It'll come in loud and clear, and scream at you, even if it's deeper. I run my discrimination at 0, and usually ground balance and then bring it down 10 to run it a little hot. I still dig the 80-81 signals because I save my copper pennies anyways, since they don't make them anymore. If I'm in a real penny infested site, I'll pass up the zincs. Just remember, sometimes it's not the detector's fault. If the site has been cherry picked clean, or just doesn't have the silver, your detector won't find it. I love my AT Pro, it felt like forever to find my first silver with it, but once I did, it was rolling in nicely. Good luck!