You've found the exact same stuff as I've got in my front yard. In coins, I've found one quarter, maybe two or three nickels, five dimes or so, and a mountain of pennies (mostly zincs), but no silvers. I've also found bullets, brass, and one bullet still in the brass, all .22 rimfire. I'm guessing that shooting for squirrels in your front yard was a lot more popular before this land was considered "in town."