But let's just keep it simple; the .357 for all uses when one finds him or herself in difficult, possibly prolonged situations.
I like these hypothetical questions, and you asked for a difficult, prolonged situation. Ask and you shall receive!
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So here I am again, wandering the wasteland, and I've lost everything. Some fellow pretending to be a trader feigned interest in the M48BO Mauser I had for trade, punched my lights out, and took everything I had...my food, my CZ Custom SP-01, and twenty gallons of whiskey it took me a week of work to make.
So I "wandered the wasteland" some more until I found a somewhat intact Chevy truck that would start. It's a 1979 C10. The trim badges say it's a Diesel engine, but I found a mid-1960s Oldsmobile 350 Rocket in there. Based on the white top half, gray bottom half, split with a gold stripe paint job, there's a pretty good chance my grandfather used to own this truck. Based on the 1996 New York State inspection, I'd say my theory holds water. I found my Grandpa's truck in the middle of "thirty miles from anywhere" in what apparently used to be Alabama.
(In real life, that old Chevy is still running, and the guy who bought it from my father is still driving it)
Eight days later, travelling at night, I roll into what's left of Springfield, Massachusetts with the truck running on fumes. My destination is of course, 2100 Roosevelt Avenue. I find the Smith & Wesson factory still standing. From the amount of sand, weeds, and broken windows, nobody's been here in at least ten years.
It's a bit of a challenge to unlock the buildings, but nothing I can't solve with a twenty-ounce framing hammer and short pry bar I found in the truck. Other than my breaking and entering, the factory buildings look intact. Now I need to turn the lights on so I can see what I'm working with.
Entering the power plant, I see that turning the lights on may be half the battle. The emergency generator is a 8-71 Detroit with an air starting system. So here I sit, pumping away, like Helen Keller's teacher trying to get the concept of "water" across.
After a bit of this, I have enough pressure built up for a start. I sound the fuel tanks, and find that there are 200 tons of diesel and 600 tons of "Bunker B" to feed four boilers. This looks like a pretty standard 1940s setup, pretty well what you'd find on an old Navy destroyer. OK, let's light this candle.
I open the air valves, and hit the air starter. The valves and rockers clatter for a few seconds. Sounds like she'll live at 100 RPM, so I open the fuel valve. The engine starts, and the emergency lights in the power plant come on. A couple of minutes later, I have the switchboard set so the generator is charging the "house" batteries, and feed 24-volt DC to the main building. I start the 12-volt water intake pump, and then the emergency evaporator. In about 45 minutes, I should have drinkable water, so this wasn't a wasted trip. Woohoo!
With the lights on, I can search the main building. After about an hour, I find an assembled revolver. It looks like a 4-inch 27 or 28, but when I check the serial number, what I'm seeing is S675! (Note that I have never seen S675 to know what barrel length it has; I just made the number up.) This gun has been in this building since 1948 or 1949!
I have already found the old service department, and there were pick racks full of .357 Magnum ammunition. I empty sand out of a fire bucket, and put in the gun and all the ammunition I can carry. I also find a cleaning rod. I had to raid a presentation case for it, but it's MINE NOW. I find a couple of bars of GI soap, a bag of shop rags, and an old Case XX pocket knife. Those will work fine for cleaning the gun if I have to.
Last thing is, I need some water. I find five or six old Stanley thermos bottles, the REAL ones, with New Britain, CT right on the label. I go back to the power plant and do the "hillbilly dishwasher" thing with the emergency evaporator to wash them out, and once they're clean, I fill them up.
Now to find some gas for the truck, and then I will go find that "trader" and get my CZ back from him.