ID this case for me please

[svt-40]

I picked up these cases at the range the other day because I could not recognize them, but what do I know?
Looks like some sort of 32 cal to my uneducated guess.
The buttstamp is 38 on top, 72 on the bottom. Berdan primed.

 

[green]

7.62x38r Russian M1895 Nagant revolver ctg.

 

[dimon]

And made in 1972 in town of Youryouzan.
(38 denotes Tula Cartridge Factory which has been evacuated to the above mentioned place in 1942 and remained there up untill 1989...)

 

[svt-40]

No surprise there were rumors of Natant being underpowered. This looks like an anemic cartridge for a military issue revolver. But I don't want to start a flame war, just comparing them to other revolver calibres of the time. If I was to bet on a duel of 455 Webley and Nagant I'd put my money on a Webley.