I do not know about any such law, and would think it to be a problem when people from another jurisdiction might travel into or through city and county of Denver. As such, I would think the state's compelling interest would be superior. Then again, I thought the same thing as pertains to open carry under state preemption until the Meyer decidion, so what do I know! LOL!
The pistol I favor carrries one in the tube and 16 in the mag. I figure that'll either be enough to do the job or I likely won't need more because I've failed to survive anyhow. Then again, I do plan to have a magazine carrier made for me, so that's in my future too!
Hopefully there will be somebody along to answer your specific question, but until then, I'd just avoid Denver. Oh, wait... I already do that.