Chennai: Cholamandalam MS General Insurance Company has crossed Rs 500 crore in gross written premium (GWP) as on March 17 for the financial year 2007-08. The premium amounts to around Rs 600 crore at pre-detraiff rates. Chola MS has registered growth 0f 68 per cent year-on-year and set a target of Rs 1,000 crore in GWP for 2008-09.