Defining a Grouse Gun – A Shotgun of Specialist Function

What makes an ideal grouse gun, or what Gene Hill would call “a gun of specialist function?” Does action type matter? What about gauge? How does the environment play into it? How has the modernization of gun-making changed grouse guns? How different is a grouse gun from a clays gun? How different is a gun built for ruffed grouse hunting versus shotguns used for other wild game? While I don’t have all the answers, I do have theories. Like any evolving tradition, they’re built on the backs of those who came before me.