This just popped in my head and I have not thought about it too deeply so forgive me if this is a silly question.
I was thinking in regards of carrying a mid size XD .40 or anything similar in the hot south concealed......
Sorry, but buying a pistol of a certain size and carrying half the ammo the gun was designed for, doesn't make sense to me personally. I'm hoping the silly idea just "popped" into your head, because if you really did think this out I'm going to be worried about you.
TIP: (even if you are already aware of it
They make guns that are small and light designed for half the ammo your pistol accomodates. And some such pistols actually accomodate larger magazines (for backup) designed for larger pistols. G26, 27 come to mind.
Just my thoughts on the matter.