For a lot of folks, sharpening a hunting knife is a project for the work bench when they’re stuck inside dreaming about being outside. But the best way to sharpen a knife to an edge that you can shave with is out in the field, when you actually need it. The reason is simple: The more a blade dulls, the harder it is to resharpen to a fine edge. The way a knife dulls is the thin metal on the cutting edge bends and rolls. Keep using the knife as it...