Found the Merc dime only 2 inches deep! Some Wheat pennies 4 and 5 inches. Well traveled area by other coin hunters and most coins were from 2" to over 6". The smaller coil really does get in between and lets the F-75 separate the targets. I use somewhere between the 'wiggle' and enough patience to get good separation in trashy areas.
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[attachment 74605 silvernewcoil.JPG]