i found this on another thread...damn no BP pistols allowed...
"
In Colorado, there are minimum velocity and energy requirements for cartridge/centerfire pistol hunting, and our BP pistols fall under the same pistol regulations. A pistol is a pistol - as far as the DOW is concerned. Since there are minimum velocity and energy requirements, and nobody can say how you loaded your BP pistol, there is no way to verify the pistol had enough powder to propell the ball fast enough to meet the requirements. So none. Zip. Nada. No BP/muzzleloading pistols. Period."