Guys,
Allow me to repeat an admonition here. Don't ever think that you are just going to switch from .357 mag to .38 special in your rifle, unless you have the time, targets, bench and patience to adjust your sights, to raise your point of impact by about a full 1 foot at 100 yards. The .38s are so slow coming out of a carbine, that you can count a full beat between firing, and hearing them hit the paper at that distance. And of course, it is almost impossible to raise a point of impact by 1 foot without also fiddling with the windage adjustments. Morevover, two boxes of .38s or .357 are darned heavy.
A break down rifle in .22 magnum would be far preferable. Perhaps a lever action or pump, with a good Skinner sight. All you would ever need, and not likely to be confiscated. Whenever there have been panics or runs on ammo, I have seen the boxes of .38s and .357 fly off the shelves, while lots of boxes of .22 mag just sit there. You could very easily carry two boxes, one with traditional round nose, and one with the V-Max.
The .22 mag will take anything from squirrel to deer, and everything in between. It is also loud enough that folks would know you mean business. The Hornaday V-Max rounds are devastatingly disruptive on thin skinned animals.
Regards,
Mannyrock
Also, the .38s and .357s are heavy.