The Wyoming Highway Patrol won’t give you a break on that. Three ounces or less is a misdemeanor, more than 3 ounces is a felony. It doesn’t matter if you bought it legally in Colorado under the new recreational marijuana law or the medical marijuana law. It’s illegal in Wyoming, period.
It’s also illegal under Colorado law to transport weed, bought legally or not, outside of Colorado. You could get hammered in both states.
Of course, getting hammered is what you wanted anyway, so maybe a little extra hammering doesn’t matter so much. Go for it. The officers in Wyoming will be glad to accommodate.