Any rifles that shoot all three cartridges? Any revolvers?
You are correct. The magnum is just a longer version of the WRF and it is too long to chamber in the WRF. Think .38 Special and .357 Magnum.yeah, sorry... I confuse WRM and WRF on a regular basis.
I don't think you can shoot .22 Magnum in an old .22 WRF gun though. I have a model 1890 that was converted from WRF to .22 Magnum, and it required resleeving the barrel, rechambering, and milling out the carrier. (At least, that's what the guy did to it...)
Shooting .22 long rifle, longs or shorts in a .22 Magnum chamber is a bad idea because you can burn yer face or lose an eye from hot gases from a split casing. The .22 Mag case is a bit wider at the base than .22LR.I have shot .22lr through a .22 mag rifle. It wont eject the shell due to it belling out the copper and the bolt wont grab it. But you can pull it out with your fingernail pretty easily. But I would call it less than ideal. I mean if you had nothing else you could get your hands on other than .22lr than it would work in a pinch. Although it wont work the other way round. The mag round wont fit in the .22lr rifle at all.
I believe that you're thinking of the older guns that shot Short, Long and Long Rifle and that you could even mix up in the under barrel or through stock brass magazine...They may have made a WMR version of the gun but it would shoot only mags efficiently.Any rifles that shoot all three cartridges? Any revolvers?