I hunted a school yard today and found some clad, but also a silver ring and a Washington State Tax Token. Its been a great day and a better day MDing.
The school may be older than you think so dig as much as posible. I hit a school where i live years ago and didnt find much but last year they built a new school and bulldozed the paly ground and I found a lot of silver rings and old kid rings from the 50's some canada dimes from the 1800's this year I am going to turn down the discriminate and dig everything. Keep hitting the school as much as posible.
means you'll get more signals. your not discriminating out pulltabs and nickels, and gold rings. I believe all three fall in the same range. in an old area you may read a ring as a pulltab and not dig with you disc set to void out pulltabs.