I usually hunt rabbits and squirrels successfully in the Pike National Forest. I'm guessing Roosevelt National Forest could be just as productive for you too.

You might want to also consider State Wildlife Areas and State Trust Lands but check with Parks & Wildlife to see what / where you can hunt and what you can hunt with (some places might be rimfire or shotgun only).

The Colorado Hunting Atlas has contact info for the CPW Area Managers and I have found CPW staff are always willing to share their knowledge regarding hunting and fishing spots.