I like to think of 22 Winchester Magnum Rimfire or 22 WMR, is like a 22 lr on roids. It is a bit more casing then a 22 lr and has a bit more punch then the 22 lr.

Check this out
http://en.wikipedia.org/wiki/.22_Win...Magnum_Rimfire

Quote Originally Posted by Hoosier View Post
What's the scoop on this stuff? Is it .22LR? I've got a Walther that shoots .22LR and I'm going to pick up a conversion kit for my AR.