The best cold weather hunting glove is the Manzella bow hunting convertible glove. I buy a new pair every year or every other year and have used them for about 8-10 years at least. I now buy a pair every other year for all of my family household members too. They have the mitten flap and the fingerless style when the flap is open. You can put a handwarmer in the flap and the flap is magnetic and the magnet holds open the flap even with the weight of the handwarmer (key). The thumb even has a "slot" where you can stick it out from under the glove which is good for shooting a rifle, taking the safety off, etc. The bowhunting glove will do all you need to do....
My experience.....I have used these on numerous trips out of state, Montana and Idaho and in Washington State. Last year was the coldest I have ever hunted in Montana, it was 24 below zero at the truck and the gloves did their job!
The biggest drawback? They aren't waterproof so I carry a spare set in my pack on wet days. Also, I tend to burn the "hairs" on them when cooking with my pack stove and it creates kind of a sandpaper that isn't kind when I wipe my nose with them!