Apparently, the word "Avsett" in Swedish means something like "intended" or "intended for". As you know, there is a thousandth or two difference in SAAMI spec groove diameter among .22, 22WRF, 22 WMR barrels - they were not supposed to be the same size. Depending on quality of what was actually done, or whether a previous owner thought it was "close enough", is very possible someone could have re-chambered it after it left the factory - I'm not so sure about what would be required, if anything, to the bolt face on that one, to change from one rimfire cartridge to another. I am not real certain that Husqvarna ever sold that rifle in that chambering, but maybe they did? It certainly would be easy enough to stamp "W" "R" "F" on that barrel, after the 22 - especially if it was not originally stamped as 22 Short, 22 Long or 22 Long Rifle.