I went out a bit today to a ball diamond that I have not hunted in 30 years. It used to yield quite a bit of silver including Barbers back in the day. I had several hits of anywhere from 29-34 on the ID with a nice high tone. I was very disappointed to dog over a half dozen crown caps...I thought these read in the 14 range. Suggestions? I was using my Equinox 600. Any suggestions? Thanks! Ted