Hand muff works great, with or without a chemical hand warmer. Another solution I like is wearing a thin glove (silk, Under Armour, polypropylene, etc.) under a heavy wool liner mitten designed to fit inside a heavy chopper mitt. I don't wear the chopper, just the wool liner. Wells Lamont used to make a nice heavy unlined wool mitt. It is easy to slip my hand out of the mitt as a deer approaches. Farm supply stores can be a good source of realatively cheap heavy weight wool mittens. Cedar Falls should have a few farm supply stores in the area!