While Hollenbeck/Three-Barrel/Royal Gun Companies made much in their advertising of their smallbores, it sure seems that most I find are 12x12x.32-40 or .32 Ideal. There is one of these guns out and about, serial number 122, that is 28x28x.22 WCF. Every dealer I've seen having that gun in the last 20 years calls it a .22 Hornet, but the Hornet didn't come out until almost 20 years after the West Virginia companies were defunct, and I doubt they were designed for Hornet pressure.