In Indiana you absolutely can carry with one in the chamber. I hate carrying paper weights around. lol As for magazine capacity their are no restrictions on that. I normally carry 15+1 in my Glock 19 but I also have several 17 round mags along with a 33 rounder which are all completely legal in Indiana. Just remember to watch out for schools,daycares,government buildings. Make sure you check on where it is not legal to carry.