diversification is great if you're staying put and have enough space to store stuff, but when you have to get moving it's a different story.

For something on the move I'd go with a semi-auto rifle in .223 and either a Glock 22/23 and a quality aftermarket barrel in 9mm, or a 4in .357mag. You could use .40/357 for carry/use, and 9mm/38sp for practice or use when the others are not avalible. 9mm rounds will fit in a .40 magazine, but will likely not be more than 70-80% reliable. If you use it for practice, you can get really good at clearing malfunctions. Or add a 17/19 magazine to your kit so you have a little more reliability.

.223 is a good all around round. I've taken everything from squirels and rabits to deer with it. But PRACTICE!!! The more you use it, the quicker and more confedent you will get with whatever you decide to use.

I'd maybe even add a small .22lr to the mix for small game that I intend to eat. Probably a bolt action magazine fed rifle. Or even a good pistol/revolver would work if one practiced enough.

just my $0.02

-Jeff