I don't know Co laws but one thing to consider,,while it is completely legal to open carry handguns in most of the western states, it does not mean you can use them to dispatch an animal unless they are an approved caliber for hunting that creature. At least this is stressed in Wyo. I love my .357 but it is NOT an approved hunting cartridge for big game and I am in violation of the law if I shoot my wounded elk with it.
I would suspect that this is just an open carry question, or at least it should be. Should not really have anything to do with whether or not you are hunting.
elkman06