Welcome
I have the BH Quick Silver, I like it a lot but would like to have a better one now after one year of swinging.
As for the Quick Silver, any US coin under 6 inches it will grab.The Quick Silver metal detector is an easy to use detector.The Quick Silver has no soft tones, mid tones, it beeps or nothing so no deep coins. The detector will sound one of three different tones, depending on the type of metal detected, iron, aluminum, nickel, coins. In air test 6 or 7 inches is the best it will get on coins unless it is 50 cent piece or bigger. Aluminum Cans and most round things will come up coins. Over coin targets walk around in a circle, if you get the high tone all the way around its money or a aluminum can. One way high tones are never coins. Gold falls in the iron, aluminum, or nickel.
I start out in all metal mode until I get tired of hearing that low tone then I block it out. I run the depth on high until I find something then bump it down to see about how deep it is. I try to dig all high tones and some of the others. No pinpoint so you will have to watch the ground under the beep each way you swing.
Any thing I can help you with let me know