Thank you for your info Blind Squirrel! I feel like anything that pinged at the beach below a 10 was generally the "iron rocks" but the rusty nails pinged a tad higher. I'm not sure what is valuable or not in the iron range so I figured I would continue digging them. I will have to go back with my new beach scoop I made and see if I get anything different!
There's always two sides to the coin if you have the patience to see. -Kathryn Budig