I own several Mosin-Nagants, including M91s, 91/30s, M38s, M44s, M59s and a Finn M39 plus a repro 91/30 sniper and an SVT40. So much for your assumption of the “obvious”. They can be quite accurate, but the action is hopeless. Are you aware the Finnish sniper you refer to only used iron sights?
Yes
I’m sure this has been posted before, but it always brings a laugh. http://7.62x54r.net/MosinID/MosinHumor.htm