I actually did not realize that you can safely (or properly?) shoot .22 WRF in a .22 WMR chambered firearm.
I *think* that Winchester made a short run of rifles of some sort in the 1980s or 1990s that actually used the old .22 WRF -- or it could be that Winchester made a run of that ammo somewhere around that time frame, but didn't make any firearms for it, just spit out some of the ammo.
It is a dead cartridge, but there has been some recent modern ammo made.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.