I know this post is almost 2 years old, but I'm surprised there are no responses. Boulder Gun Club has a multi-year waiting list to get in. I shot there once as a guest many years ago but honestly don't recall much positive or negative, except "it's close".
I recently joined Colorado Rifle Club (crci.org) out north of Byers. It's a drive for me (1.5 hrs each way) but they have pretty much everything, from archery, sporting clays, small bore, 1000 yard highpower, schuetzen rifle to multiple pistol bays and competitions. They just recently re-opened for events, limited as we are by this stupid home quarantine/limited contact restrictions.
To me - very worth the drive.