Army is going to DSL or Durable Solid Lubricant applied during the manufacturing process. There are side by side photos of bolt wear with DSL v. CLP; the results are pretty amazing. Waiting for a civilian version to come out soon.
Until then, anything you use in cold weather, use sparingly. I like CLP, Frog Lube, RIG, and especially the Michigan product Metalloid's Duck Hunter's Delight out of Sturgis. Stay away from WD-40 in it's original formulation. It just doesn't hold up for very long. Rem oil can get a bit gummy in low temps, use veeeerrrry sparingly. Hoppes seems to be fine in moderate amounts too, as does dry Graphite lube.