Are they basically a .22 short blank. ln fact shorter than a .22 short? A CB blank perhaps is the correct definition?
If so they used to sell tins of blanks like that in sports shops for one of the popular (cheap) starting pistols when I was a boy.
The No1 was the smallest blank. Used in I think a Webley (?) starting pistol. It looked very much like a small automatic.
It had a sliding magazine that went from front to back and it used to discharge upwards out of the top of what would have been the slide on a real pistol.
I don’t know about the word “saloon” being on them though, not in my time as far as I recall. I would take that as just being the generic name for low powered .22 cartridges at that time.