Former Exira star Britta Christofferson captured a victory Saturday at the Musco Twilight track and field meet at the University of Iowa.  Christofferson, a senior for the Cyclones, won the Hammer Throw event with a toss of 193-feet-six-inches.  Her throw was nearly 13 feet better than the runner-up.  The Iowa State track and field team is back in action This weekend at the 102nd running of the Drake Relays.