Choose a gun and caliber you are comfortable with
when drawing to shoot. Keeping in mind the adrenalin factor as well. You will want something you can handle well both gun and Caliber. This takes practice mentally. That's why I personallywould choosemy .357 magnum 4" S&W M19 Combat Magnum (1970). I load it with Federal 158gr. hollow points. I feel very comfortable with this gun and shoot it well.I carry it in a Bianchi 5BHL holster, strong side right.
If Ifelt a .357 mag. might not work that day, then I would gowith aMini-14(w/30rd Mag)across my shoulderjust in case, you know.