Maybe if Winchester marketed 22 wrf as a low power pinker version of 22 MRF it would have a following and thus a market.
The .22 WRF is a cool old round but can be a bit pricey these days due to limited availability. I did some hunting with an old Winchester Model 1890 in .22 WRF and it put the smackdown on desert jackrabbits quite well. I bought a few boxes of it back when it could be found for about $5/50 (when you could also get a 100 Mini-Mags in .22 LR for about $3.00) and shot it in the magnum cylinder of my Ruger Single Six. I only shot the lead flatpoint loads, if you can find those they should work just fine in a Colt Police Positive in that caliber.
I have a hardback book Pistol and Revolver Cartridges by Barnes, which seems thorough and authoritative, but the wide ranges given for these various dimensions can't be right. Although not perfect, and done by volunteers, Wikipedia seems to be a better reference.Wikipedia is INFORMIS for their errors. Some people still believe that if they read it online it must be true!
No problem!victorio1sw, I apologize if you feel that I had flamed you. If you look at the specs for the 22LR the difference between bullet diameter and case mouth is .003 inches. That means the case mouth walls are .0015 inches. Is that correct?