Those are either a Bull Snake or a faded Pygmy rattler.. The Pymy rattler is protected. Our Gov'mnt in their wisdom ruined the pygmy's habitat when they created the Flaming Gorge..i lived in Evanston 80 to 86 only saw 2 snakes. one at flaming gorge res.
Im thinking that rattler is about the size of a 12 ga improved cylinder choke pattern at 20 feet. But I might be wrong. I KNOW I would instantly test my theory, three times or until the mag was empty.That is a bull snake. Those and prairie rattlers are most of what I see in CO.
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Any pics?Black snakes will munch down on copperheads.