One of the best features about the AT Pro is the tones, that crushed can sounded like a huge target way down there I am sure, but those coins and rings are always a softer tone, same pitch, just not as loud. I run mine in Pro mode, cutting out everything under 35, iron audio on, with it on you will hear a little grunt when you sweep over those bottle caps along with the higher tone. I dig every thing that's between 50 and 70, that's where those gold rings are. Dry sand I dig it all anyways.Now if I am in my spot in the lake, I only dig midrange because the bottom is so hard to get a target out of. Pays off though. Keep it up, the rings will come eventually. One thing about that beach you have to remember..... your not the only one out there. Lots of competition. Good luck and HH