As to caliber, I carry a tiny 32Cal Beretta Automatic in my pocket most of the time. It has plus P ammo and I have 8shots plus a fresh mag. In my truck I keep my 45 Cal 1911A1 and by my bed I have a double barreled 12 gage with number 1 buck. When I am on the train to Dallas I carry my 45 cal derringer loaded with 410 bore triple 0ught buck just to make sure I don't take out a bunch of cars, and at about 15 feet that little derringer will place five 36 caliber slugs in an area about the size of soccer ball. I am never unarmed except at city hall and the hospital. Damned laws won't let me carry there.
Salute
BT