It's always surprising how often the Mdl 24 pops up on various forums. The definitive forum is:
Savage24.com One can learn a lot there, and periodically, there are some for sale.
One of that forum's stickies have all you ever needed to know about Mdl 24s. Paladin, I trust you'll give credit where credit is due.
When discussing Mdl 24s, one must use the adverbs "apparently" and "usually"....there are lots of variations.
If you're looking for one, the 22 L.R./.410 are most common, followed by .222 Rem/20 gauge. .22 Mag are often paired with .410 bore, 20 & even 12 gauge. More rare upper barrels are those with .22 Hornet, 30-30, .357 Mag, usually paired with 20 or 12 gauge. There are even some .357 Max, but Savage apparently never made them in .243 or any of the .308 class cartridges.
.222 Rem and .223 Rem were (apparently) the only non-rimmed chamberings produced, and both had 1-14" twists.
Later models moved the barrel selector from the right side of the receiver to a toggle on the hammer. Many posts in the above-mentioned forum say the hammer selector might be less prone to breakage.
Prior to 1952 (?), they were marked Stevens and the stocks were birch or tenite. Then they were marketed as Savage and stocked in tenite or walnut (there are some lovely original walnut stocks). Later, as Savage fortunes declined, birch stocks returned. At some point, case-colored receivers disappeared.
There is no love....that's none, nada....for the current Savage Mdl 42 in the Mdl 24 forum. I myself have picked up the 42 in my LGS, and hurriedly returned it to the clerk in horror.
I bought my first (22.LR/.410) in 1957, by mail from Stoegers, using earnings from corn detasseling and mowing lawns. My mom graciously cooked all those Illinois rabbits and squirrels, and it wasn't until years later that I learned that I shouldn't have been able to shoot all those pheasants with a puny 2 1/2" .410.
Couple of years ago, I bought a .222/20. At first I thought I should open the chamber to .223, but since the rifling is 1-14" one would be restricted to sub-50 or 55 gr. bullets anyway. As luck would have it, even with my old eyes, my .222 Rem barrel is extremely accurate, so I ended up leaving it as is. Bought some .222 brass, already had powders, primers and lots of 32-52 gr. bullets. Handloaded performance isn't that much different from the .223. I did spiff up the stock and take off those awful white-lines.
I used the heck out of my original .22 lr/.410 as a kid in Illinois, but as an adult here in the west, found myself using more specialized guns for both bird and big game hunting. My original gun mostly sits in the safe, coming out for occasional plinking.
However, I carry my 222/20 as a truck gun....because I can....in the hopes that I'll "need" it someday. Yeah, right.