JMO,but production guns and 1000 yd BR dont go together very well.At least not without a bunch of work and money.If your interested in long range BR I would head in the direction of custom actions,barrels etc.Some popular calibers are,but certainly not limited to are,300 ackley,6.5-284,300WSM,300WinMag,30 BooBoo,7mmWSM.
Im going to try my luck in some factory class 600 yd shoots this year and am waiting to get one of Savages new 223s with a 1-7" twist that are new for 2007.
Heres a link to a popular 1000 yd BR forum.
Good luck shooting! [img]/ubbthreads/images/graemlins/cool.gif[/img]