It also is not chambered for the .22 Remington Automatic. I tried to shoot some of that stuff in mine, got bulged and split cases so I sent it back to Winchester and had a new barrel fitted (this was back in the 1950's).
Got the newly barrelled rifle back, loaded the magazine and started shooting. Same song, just a different verse. I never did find any .22 Winchester cartridges for it, so I sold it.