How does it compare to a remington sendero?
The 70 WSSMs were only cataloged in 25 WSSM during 2004 and 2005, so if you google either of those Winchester/USRA catalogs, you should be able to find the factory specs.
I have a Winchester/USRA 70 WSSM Stealth II in 25 WSSM and, IIRC, it weighs a little over 10 lbs. with bases, but no scope. It is a long, heavy, rifle that is best suited to sniping at long distance targets in circumstance where you don't have to carry it far from your vehicle or trusty steed. I used mine for shooting pdogs with 75 grain Sierra HP and VMax handloads running right at 3,700 fps.
EDIT: Mine has a synthetic stock.