RE: Cartridge Choice
The 300WSM out performs just about everything. Other then that, you can opt for a 300 Win Mag or a 7mm Rem Mag, or a 270 WSM.
7mm WSM also, but doesn't appear to be very popular.
BTW, who told you that the 30-06 bullet drop is too much past 200 yards? I don't believe that personally. Hey, do some research on web sites such as Remington and Federal.