Correct me if I'm wrong, but isn't a cap n' ball revolver still considered a "firearm" if it's capped and loaded? Are Texas laws different? Because I know in some places that would still be illegal to carry the gun loaded and capped into a hospital if gun aren't permitted there.
Regardless, nice gun! I really like it. As for cap n' ball guns for CCW, I think they're underrated. With the chambers and nipples sealed with beeswax, they can be very air and water tight so no risk of corrosion or ruined powder etc.
I've been thinking of getting an 1860 Army to have cut down to make an "Avenging Angel" type concealable piece. With a full charge of Triple Seven or even FFFG, it should make quite the impression! With some upgrades like Slix-Shot nipples (designed to use the excellent Remington #10 cap) and maybe the pin upgrade to keep cap fragments away from the action, I'd bet the gun would be very reliable.
Right now I am planning on carrying my Cimarron 1851 Colt Navy as a "car gun" when traveling. I've got it upgraded with Slix-Shot nipples but have yet to shoot the gun, if it proves reliable at the range it'll get used as primary home defense weapon and like I said in the car on road trips. A .36 round ball with a full charge behind it is nothing to sneeze at, and supposedly hits much harder than the on paper ballistics might suggest.