Magnum Research has a .22WMR that I have read good reviews on. They are usually a little pricey when you do come across one. Dont see very many of them. I have always wanted one but never pulled the hammer on one to buy.
I To was looking for a Ruger 10/022 mag they stopped making them in 2006 So I ended up getting the Remington 597LS after putting a VQ target hammer in it I'm very happy with it shoots 3/8 groups at 50 yards! CZ also makes a 22mag 512? I might have looked into that before I got the 597
CZ 512 is awesome, feeds unlike my Ruger, accurate, thin mags that fit in your pocket well, I have a Aimpoint H-1 on mine, excellent Jack rabbit rifle, downside is mags are spendy