XDm 9mm.....19+1 capacity.
I recently started to carry this. If you need more than 19, you are in serious doo doo
I usually carry a Glock G19 and a spare mag. 30 rounds total. When I carry the full sized 1911 (.45) I bring along one or two spare mags, 16 or 24 rounds total. With flash mobs (on bikes or not) becoming more common I’m thinking of adding another mag to my standard carry, or maybe just having a couple in my car.