The key to warm feet in winter is an extra felt innersole under the foot in addition to the standard felt liner. Gloves are always a compromise. If they are warm, they are too bulky for shooting. If they are not too bulky, they are not warm enough. You also might consider a small change in your ear protection for winter.
Ear muffs, rather than ear plugs, can make a world of difference if there is a bit of a wind chill.
Lastly, but perhaps most important. Every survival manual will tell you that a large percentage of your body heat escapes from your head. A cap, especially one of the fashionable Connecticut Travelers hats, can make all the difference between being kool and cool. Also, be aware that the winter sun is much lower in the sky. The brim on that cap could help you avoid a little unwelcome dazzle.