The Mosin Nagant also saw service in Estonia after WW2 as a part of the Soviet Union. In the photo are Soviet (Estonian) soldiers in training. Notice the second rifle which has a bent bolt of some sort but does not appear to be a sniper rifle.
Simo Hayha, "The White Death" is considered to be the most effective sniper in Human History. He served in the Finnish Civil Guard during the Winter War with the Soviet Union in 1939-1940. Over the course of 100 days on the Kollaa Front, Hayha killed 705 Soviet Soldiers, including 542 with his bolt-action M28-30 Mosin Nagant carbine. He also refused to use a scope, making all of his kills with traditional iron sights.
Two Red Army soldiers rest keeping their Mosin Nagant rifles handy, while a third is cleaning the bolt of his own weapon. The Mosin Nagant is still in circulation, with many WW2 specimens shooting straight and accurate even after more than 80-90 years in existence.