List any caliber (.380ACP, 9mm, .45ACP, .300 Win. mag., 105mm) if what you wish isn't shown. But, please consider the many applications this round will need to fill.
Politics what they are... A day may well come when you really have to say. "I can only take one with me!"
Try not to let action type, or what's currently in your posession influence. Just practicality of the round itsself.
"Is this at least acceptable for me to hunt small game, deer, other food sources with?"
"Can it stop a preditor / prowler / thief, and defend my life and family?"
"If the need to conceal the weapon arises can I hide some type of weapon capable of firing this round?" (may be issues with 105mm)