I think, this is correct. I have several of this original 32Gauge cases in brass and steel configurations. All bear an open stamp of USSR, the caliber and the year of manufacture.
Its easy to swage them, to the dimensions, mentioned for the 10,5x70R.
They cannot be for the MN-Nagant Rifle, converted to this caliber, as the OAL will be to long, to fit into the framework of the rifle.
A single shot loading trough the back would work, if you take the bolt out…but I doubt, that russiam hunters will do such a work. In 1981 (as the cartridge mark indicates, where much better solutions on the market).
Most hunters, which I encounter in Russia, using either shotguns, with partially rifling, so they can use both (Slugs with good accuracy and shotshells), or relative modern hunting rifles in 9,3x54R, some in .308M (=modernized) -more or less a 7,62x51 in western standard configurations and the big 9,3x64 (a copy of the german Brenneke Magnum round).
In no way, this 10,5x70R is a factory product…its more a homemade thing. Maybe for some homeconverted rifles. But if, what type of Rifle, as the action of the 10,7mm Berdan II Rifle will also be to short, to handle such a long cartridge.
And I do not knew, of any barrel fabricated in 42lines (10,66mm) in the last years after the WW2…