It is easy to fire 22LR in any single shot 22mag rifle or pistol.
All you do is file off the rim of a fired 22 mag case and insert that
into the barrel. Then insert 22 LR and fire. this will expand and
snug the fired 22 mag case in the chamber and you can manually
reload and fire repetively.
Try it, you can just insert a 22 LR into a fired 22 mag case and the
fit is pretty good.
On some bolt actions, the extractor might not grab the rim of
the 22 LR real well because it is slightly smaller in diameter but
if it not hard to get to you can pull it out with fingernails etc.
Later to remove the case liner from teh chamber, use an ice pick
or something sharp to bend the end of the shell casing a little
bit so you can grab it with needle nose pliers.
The bore is slightly bigger in the 22mag so the accuracy is supposed
to be worse but I didnt notice as I was not shooting targets
