I can't believe nobody's mentioned it yet (or I missed it), but get the 10mm and load it up with Buffalo Bore's smoking hot 10mm rounds
and you're good to go.
Though some of it's more strident devotees may get a little over the top with their claims in that it will stop a tank or cause automobiles to explode after a few shots like on TV, the 10mm is an amazing cartridge. I wouldn't be willfully shooting a bear with one, but as an all-around field gun it's fantastic.
"Our contract called for 16 cases of rifles and ammunition for $10,000 dollars, not a machine gun...........That is our present to the General"-Pike Bishop
“When fascism comes to America, it will be wrapped in the flag and carrying a cross.”