Using two-tone ferrous in deep-target sites with heavy, heavy iron forces you to sweep super slow and study every non-ferrous signal carefully. Result is that you end up digging some signals which you might otherwise have decided to pass on.
Pulled some teens wheats, an 1894 IH, a couple V-nickels and another fat Indian - this one 1863 - from a heavy iron-infested site that has been worked over for years by Minelabs. Every one of these targets had something else in the hole except one of the V-nickels. This fat Indian gave me ferrous numbers from 12 to 28, with conductive numbers ranging from 13 to 16, and had a large nail in the hole. I was expecting a nickel. The last one (1859) was a more solid 24-25 conductive.
Pulled some teens wheats, an 1894 IH, a couple V-nickels and another fat Indian - this one 1863 - from a heavy iron-infested site that has been worked over for years by Minelabs. Every one of these targets had something else in the hole except one of the V-nickels. This fat Indian gave me ferrous numbers from 12 to 28, with conductive numbers ranging from 13 to 16, and had a large nail in the hole. I was expecting a nickel. The last one (1859) was a more solid 24-25 conductive.