You should be able to filter for sold ones on Gunbroker to get some idea of what the going price is. Prices here on everything are generally down a bit. Bottom line, as always, is what it's worth to you. Never cared for any of those much myself, so my bottom line on them is pretty low. Pretty good guns by all accounts, just not to my taste.
If you handload, it's pretty easy to make a ".22 magnum" out of a .223 or .22 Hornet with 5744, Trail Boss, or some pistol powders.
