Under Armour cold gear shooting gloves. I have mine in black/dark blue.
Special grip texture so you can maintain a firm grip, works quite well.
Also, the trigger finger on both hands can be folded back, only exposing said finger. It works well enough, I went shooting in 15 degree +high winds the other day and my hands were relatively warm. Though my trigger finger did get pretty damned cold after an hour, there is only so much you can do to keep warm and maintain a tactile sensation.

Seriously great for 30-50 degree weather though.