+1 on what Trueblue said, I also hunt Iowa with the same load's. Have used it for more years than I care to confess. Copper plated 5's will penetrate thru the breast bone on pheasants, where lead shot merely flattens against it. I first read of copper plated 4's &5's in a book by Nash Buckingham, he and his peer's were using it back in the 1940's at least. Where steel is required, the Prarie Storm's should fill the bill.