You mention that the date on your cartridges did not match ones discussed by me (I don’t even remember the discussion - I don’t collect this caliber, but have had a yellow box with a few cartridges in it before, that someone gave me, from some international shoot in Phoenix, Arizona years ago. I haven’t had it for a long time and don’t recall it off-hand, although I may have stuff in my files about it.) However, you did not remind us of the date I mention, nor did you tell us the date on your cartridges, both of which are germane to your question. The rounds I have were, as I recall, a shorter case OAL than the military Russian Nagant 7.62 cartridges, and had the wadcutter bullet fully seated inside the case.
I would think from the box label that the date on cartridges in the box you show should be “74”.
EOD mentions that yours should have the wadcutter bullet, and are reloads. However, they seem to be short for the box, slightly, even with a bullet protruding from the case mouth 8+ millimeters. If they were originally WC bullets, and the cases have not been shortened, I would think the box would not be so deep.
Well, I only got into this thread because my name was mentioned. I am no authority on any revolver round, as I have never collected them or spent much time in study of that subject.