Of the following which do you guys think would be the better Grizzly bear rifle/bullet combo? I will also be using it on caribou on the same hunt.

I will be up in the Brooks Range unit 26 in September 2009 and I am obsessing on which one of these to bring.

Winchester Model 70 synthetic stainless 300 Win Mag 180 or 200 grain Nosler Partition fixed Leupold VXlll 3.5x10x40mm .

Weatherby Euromark wood stock blued barrel 300 Weatherby Mag 180 grain Barnes X fixed Leupold VXlll 4.5x14x40mm

Winchester Model 70 synthetic stainless 375 H&H 300 grain Nosler Partition Talley detachable mounts VXlll 1.5x5x20mm and backup scope Leupold VXlll 1.75x6x32mm