.22 WMR ammo is a lot easier to get now than it was. Winchester and CCI have made runs, large runs I think, of it and compared to 25 years ago it downright easy to get. It is a great cartridge as well. Much better than .22 LR. The trouble with it is that more development money has been spent on the LR than just about any other cartridge and you can get some darn accurate and consistent .22 LR ammo. Not so sure about the WMR. However, the late production Winchester ammo was accurate in my gun (a Remington 12C) as well as in my Single-Six and TC Contender.