We discussed earlier this cartridge at the Ukrainian forum and treshkin has assumed that it is a cartridge with a №354 bullet (by catalog DWM). Now I have a box as the proof of his assumption.
The cartridge is in the middle. Between 7.62х54R (above) and 8x50R Mannlicher (SP round nose bullet)
Box in bad condition, but you can look at its photo here:
picasaweb.google.com/1027844212 … kcKd76ueEw