Recently I was beach hunting with a friend (EQX 600) who detected almost exclusively in pinpoint mode and did very well. After watching him pull several silver coins out of the black sand and cobble, I asked him to let me try to hit his next target. Sure enough, my 800, beach 2, recovery 4, F2=0, full horseshoe, did not hit a silver dime.
A few days later, I spent 3 hours trying his method. Using the same settings, beach 2 hit about 90% of the targets. The targets it missed were silver